diff --git a/harness/temporalHelpers.js b/harness/temporalHelpers.js
index 368f8b3398..947ba282ec 100644
--- a/harness/temporalHelpers.js
+++ b/harness/temporalHelpers.js
@@ -895,6 +895,44 @@ var TemporalHelpers = {
     assert.compareArray(actual, expected, "property getters not called");
   },
 
+  /*
+   * A custom calendar used in prototype pollution checks. Verifies that the
+   * fromFields methods are always called with a null-prototype fields object.
+   */
+  calendarCheckFieldsPrototypePollution() {
+    class CalendarCheckFieldsPrototypePollution extends Temporal.Calendar {
+      constructor() {
+        super("iso8601");
+        this.dateFromFieldsCallCount = 0;
+        this.yearMonthFromFieldsCallCount = 0;
+        this.monthDayFromFieldsCallCount = 0;
+      }
+
+      // toString must remain "iso8601", so that some methods don't throw due to
+      // incompatible calendars
+
+      dateFromFields(fields, options = {}) {
+        this.dateFromFieldsCallCount++;
+        assert.sameValue(Object.getPrototypeOf(fields), null, "dateFromFields should be called with null-prototype fields object");
+        return super.dateFromFields(fields, options);
+      }
+
+      yearMonthFromFields(fields, options = {}) {
+        this.yearMonthFromFieldsCallCount++;
+        assert.sameValue(Object.getPrototypeOf(fields), null, "yearMonthFromFields should be called with null-prototype fields object");
+        return super.yearMonthFromFields(fields, options);
+      }
+
+      monthDayFromFields(fields, options = {}) {
+        this.monthDayFromFieldsCallCount++;
+        assert.sameValue(Object.getPrototypeOf(fields), null, "monthDayFromFields should be called with null-prototype fields object");
+        return super.monthDayFromFields(fields, options);
+      }
+    }
+
+    return new CalendarCheckFieldsPrototypePollution();
+  },
+
   /*
    * A custom calendar used in prototype pollution checks. Verifies that methods
    * are always called with a null-prototype options object.
diff --git a/test/built-ins/Temporal/Calendar/prototype/dateAdd/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/dateAdd/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..f2db284eaf
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateAdd/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateadd
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.dateAdd(arg, new Temporal.Duration());
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dateUntil/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/dateUntil/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..473b4eab42
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dateUntil/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dateuntil
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg1 = { year: 2000, month: 5, day: 2, calendar };
+const arg2 = new Temporal.PlainDate(1977, 11, 19);
+
+instance.dateUntil(arg1, arg2);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (first argument)");
+
+calendar.dateFromFieldsCallCount = 0;
+
+instance.dateUntil(arg2, arg1);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (second argument)");
diff --git a/test/built-ins/Temporal/Calendar/prototype/day/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/day/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..8a0b10cd80
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/day/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.day
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.day(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..b90f7f82d7
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dayOfWeek/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dayofweek
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.dayOfWeek(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/dayOfYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/dayOfYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..bca628c0f9
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/dayOfYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.dayofyear
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.dayOfYear(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInMonth/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/daysInMonth/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..6a4924c0a2
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInMonth/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinmonth
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.daysInMonth(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInWeek/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/daysInWeek/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..e2e2f472d8
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInWeek/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinweek
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.daysInWeek(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/daysInYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/daysInYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..9d14fa2b87
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/daysInYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.daysinyear
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.daysInYear(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/inLeapYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/inLeapYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7ee264b639
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/inLeapYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.inleapyear
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.inLeapYear(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/month/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/month/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..1b8550f796
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/month/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.month
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.month(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthCode/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/monthCode/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7390575a7d
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthCode/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthcode
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.monthCode(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/monthsInYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/monthsInYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..0728948c2b
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/monthsInYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthsinyear
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.monthsInYear(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/weekOfYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/weekOfYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..24233a730a
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/weekOfYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.weekofyear
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.weekOfYear(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Calendar/prototype/year/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Calendar/prototype/year/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..9af0d86859
--- /dev/null
+++ b/test/built-ins/Temporal/Calendar/prototype/year/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.year
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.year(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Duration/prototype/add/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Duration/prototype/add/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..fb97ee2f9e
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/add/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.add
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Duration(1, 0, 0, 1);
+const relativeTo = { year: 2000, month: 5, day: 2, calendar };
+instance.add(new Temporal.Duration(0, 0, 0, 0, -24), { relativeTo });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Duration/prototype/round/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Duration/prototype/round/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..c1fbe47f8b
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/round/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.round
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Duration(1, 0, 0, 0, 24);
+const relativeTo = { year: 2000, month: 5, day: 2, calendar };
+instance.round({ largestUnit: "years", relativeTo });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Duration/prototype/subtract/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Duration/prototype/subtract/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..f4f043136e
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/subtract/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.subtract
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Duration(1, 0, 0, 1);
+const relativeTo = { year: 2000, month: 5, day: 2, calendar };
+instance.subtract(new Temporal.Duration(0, 0, 0, 0, 24), { relativeTo });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/Duration/prototype/total/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/Duration/prototype/total/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..d35ab02078
--- /dev/null
+++ b/test/built-ins/Temporal/Duration/prototype/total/relativeto-propertybag-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.total
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Duration(1, 0, 0, 0, 24);
+const relativeTo = { year: 2000, month: 5, day: 2, calendar };
+instance.total({ unit: "days", relativeTo });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDate/compare/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/compare/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..c7820420f4
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/compare/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.compare
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg1 = { year: 2000, month: 5, day: 2, calendar };
+const arg2 = new Temporal.PlainDate(1976, 11, 18);
+
+Temporal.PlainDate.compare(arg1, arg2);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (first argument)");
+
+calendar.dateFromFieldsCallCount = 0;
+
+Temporal.PlainDate.compare(arg2, arg1);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (first argument)");
diff --git a/test/built-ins/Temporal/PlainDate/from/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/from/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..e2061e81b4
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/from/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.from
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg = { year: 2000, month: 5, day: 2, calendar };
+Temporal.PlainDate.from(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/equals/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..1bab8319c7
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/equals/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.equals
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDate(2000, 5, 2);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.equals(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/since/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/prototype/since/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..b4a603f536
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/since/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.since
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDate(2000, 5, 2);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.since(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..d16ae4d32e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.toplainmonthday
+description: >
+    Calendar.monthDayFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDate(2000, 5, 2, calendar);
+instance.toPlainMonthDay();
+assert.sameValue(calendar.monthDayFromFieldsCallCount, 1, "monthDayFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..08c546c1f9
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.toplainyearmonth
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDate(2000, 5, 2, calendar);
+instance.toPlainYearMonth();
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/until/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/prototype/until/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..5aa613c6dd
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/until/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.until
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDate(2000, 5, 2);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.until(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDate/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDate/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..985d7415db
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDate/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.with
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDate(2000, 5, 2, calendar);
+instance.with({ day: 24 });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/compare/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/compare/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..c772880030
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/compare/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.compare
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg1 = { year: 2000, month: 5, day: 2, calendar };
+const arg2 = new Temporal.PlainDateTime(1976, 11, 18);
+
+Temporal.PlainDateTime.compare(arg1, arg2);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (first argument)");
+
+calendar.dateFromFieldsCallCount = 0;
+
+Temporal.PlainDateTime.compare(arg2, arg1);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (second argument)");
diff --git a/test/built-ins/Temporal/PlainDateTime/from/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/from/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..0dfc7e0ff3
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/from/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.from
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg = { year: 2000, month: 5, day: 2, calendar };
+Temporal.PlainDateTime.from(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..645a10124e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.equals
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.equals(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..ca8e43431c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.since
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.since(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..d6b4fb943c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.toplainmonthday
+description: >
+    Calendar.monthDayFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321, calendar);
+instance.toPlainMonthDay();
+assert.sameValue(calendar.monthDayFromFieldsCallCount, 1, "monthDayFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..0770066dfb
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.toplainyearmonth
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321, calendar);
+instance.toPlainYearMonth();
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..e7c11b8ecb
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.until
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.until(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..bb98828e7c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.with
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321, calendar);
+instance.with({ day: 24 });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..29309e7dde
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/withPlainDate/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.withplaindate
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.withPlainDate(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainMonthDay/from/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainMonthDay/from/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..08f69497a2
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/from/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.from
+description: >
+    Calendar.monthDayFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg = { monthCode: "M05", day: 2, calendar };
+Temporal.PlainMonthDay.from(arg);
+assert.sameValue(calendar.monthDayFromFieldsCallCount, 1, "monthDayFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainMonthDay/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..b40660dd0e
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.equals
+description: >
+    Calendar.monthDayFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainMonthDay(5, 2);
+const arg = { monthCode: "M05", day: 2, calendar };
+instance.equals(arg);
+assert.sameValue(calendar.monthDayFromFieldsCallCount, 1, "monthDayFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..a5014f3f51
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.toplaindate
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainMonthDay(5, 2, calendar);
+instance.toPlainDate({ year: 2019 });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..a69678363c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainMonthDay/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.with
+description: >
+    Calendar.monthDayFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainMonthDay(5, 2, calendar);
+instance.with({ day: 24 });
+assert.sameValue(calendar.monthDayFromFieldsCallCount, 1, "monthDayFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..58e3993362
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toPlainDateTime/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.toplaindatetime
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.toPlainDateTime(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7075d69c23
--- /dev/null
+++ b/test/built-ins/Temporal/PlainTime/prototype/toZonedDateTime/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tozoneddatetime
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainTime(12, 34, 56, 987, 654, 321);
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.toZonedDateTime({ plainDate: arg, timeZone: "UTC" });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/compare/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/compare/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7ec6a02a7d
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/compare/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.compare
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg1 = { year: 2000, month: 5, calendar };
+const arg2 = new Temporal.PlainYearMonth(2019, 6);
+
+Temporal.PlainYearMonth.compare(arg1, arg2);
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should be called on the property bag's calendar (first argument)");
+
+calendar.yearMonthFromFieldsCallCount = 0;
+
+Temporal.PlainYearMonth.compare(arg2, arg1);
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should be called on the property bag's calendar (second argument)");
diff --git a/test/built-ins/Temporal/PlainYearMonth/from/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/from/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..2db044e3fe
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/from/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.from
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const arg = { year: 2000, month: 5, calendar };
+Temporal.PlainYearMonth.from(arg);
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/add/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/add/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..97f0737b67
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/add/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.add
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5, calendar);
+instance.add(new Temporal.Duration(1));
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7383d68086
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.equals
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5);
+const arg = { year: 2000, month: 5, calendar };
+instance.equals(arg);
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..3d595c0512
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5);
+const arg = { year: 2000, month: 5, calendar };
+instance.since(arg);
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/since/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/since/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..cd68ce8b43
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/since/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5, calendar);
+instance.since(new Temporal.PlainYearMonth(2019, 2));
+assert.sameValue(calendar.dateFromFieldsCallCount, 2, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/subtract/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/subtract/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..adfcb98196
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/subtract/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.subtract
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5, calendar);
+instance.subtract(new Temporal.Duration(1));
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7bb1b1886c
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.toplaindate
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5, calendar);
+instance.toPlainDate({ day: 24 });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..83f4bd923b
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.until
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5);
+const arg = { year: 2000, month: 5, calendar };
+instance.until(arg);
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/until/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/until/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..7e71f6f8b0
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/until/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.until
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5, calendar);
+instance.until(new Temporal.PlainYearMonth(2019, 2));
+assert.sameValue(calendar.dateFromFieldsCallCount, 2, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..3e842c54fd
--- /dev/null
+++ b/test/built-ins/Temporal/PlainYearMonth/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.with
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.PlainYearMonth(2000, 5, calendar);
+instance.with({ year: 2019 });
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..cfe33e430a
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getInstantFor/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getinstantfor
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.TimeZone("UTC");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.getInstantFor(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..d74bdf4aa9
--- /dev/null
+++ b/test/built-ins/Temporal/TimeZone/prototype/getPossibleInstantsFor/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getpossibleinstantsfor
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.TimeZone("UTC");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.getPossibleInstantsFor(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/compare/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/compare/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..0f36f38ccc
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/compare/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.compare
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const timeZone = new Temporal.TimeZone("UTC");
+const arg1 = { year: 2000, month: 5, day: 2, timeZone, calendar };
+const arg2 = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, timeZone);
+
+Temporal.ZonedDateTime.compare(arg1, arg2);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (first argument)");
+
+calendar.dateFromFieldsCallCount = 0;
+
+Temporal.ZonedDateTime.compare(arg2, arg1);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar (first argument)");
diff --git a/test/built-ins/Temporal/ZonedDateTime/from/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/from/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..6d75571b00
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/from/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.from
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const timeZone = new Temporal.TimeZone("UTC");
+const arg = { year: 2000, month: 5, day: 2, timeZone, calendar };
+Temporal.ZonedDateTime.from(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..79a0560dec
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/equals/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.equals
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+const arg = { year: 2000, month: 5, day: 2, timeZone, calendar };
+instance.equals(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..a6ad8e4d03
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/since/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.since
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+const arg = { year: 2000, month: 5, day: 2, timeZone, calendar };
+instance.since(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..c358b4cc82
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplainmonthday
+description: >
+    Calendar.monthDayFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.ZonedDateTime(0n, "UTC", calendar);
+instance.toPlainMonthDay();
+assert.sameValue(calendar.monthDayFromFieldsCallCount, 1, "monthDayFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..a333923743
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/toPlainYearMonth/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplainyearmonth
+description: >
+    Calendar.yearMonthFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.ZonedDateTime(0n, "UTC", calendar);
+instance.toPlainYearMonth();
+assert.sameValue(calendar.yearMonthFromFieldsCallCount, 1, "yearMonthFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..fbffafa241
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/until/calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.until
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+const arg = { year: 2000, month: 5, day: 2, timeZone, calendar };
+instance.until(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..5189c887bc
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/with/calendar-fromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.with
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.ZonedDateTime(0n, "UTC", calendar);
+instance.with({ day: 24 });
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should have been called on the calendar");
diff --git a/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..6b136a23fe
--- /dev/null
+++ b/test/built-ins/Temporal/ZonedDateTime/prototype/withPlainDate/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.withplaindate
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.ZonedDateTime(1_000_000_000_000_000_000n, "UTC");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.withPlainDate(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/intl402/Temporal/Calendar/prototype/era/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/intl402/Temporal/Calendar/prototype/era/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..99d309848a
--- /dev/null
+++ b/test/intl402/Temporal/Calendar/prototype/era/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.era
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.era(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");
diff --git a/test/intl402/Temporal/Calendar/prototype/eraYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js b/test/intl402/Temporal/Calendar/prototype/eraYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
new file mode 100644
index 0000000000..745c25004c
--- /dev/null
+++ b/test/intl402/Temporal/Calendar/prototype/eraYear/argument-calendar-datefromfields-called-with-null-prototype-fields.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.erayear
+description: >
+    Calendar.dateFromFields method is called with a null-prototype fields object
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarCheckFieldsPrototypePollution();
+const instance = new Temporal.Calendar("iso8601");
+const arg = { year: 2000, month: 5, day: 2, calendar };
+instance.eraYear(arg);
+assert.sameValue(calendar.dateFromFieldsCallCount, 1, "dateFromFields should be called on the property bag's calendar");