Ensure reference data is emitted when calendarName = 'always'

References:

+ https://github.com/tc39/proposal-temporal/issues/1971

test/built-ins/Temporal/PlainMonthDay/calendar-always.js

@@ -0,0 +1,24 @@
+// 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
+description: If calendar name is to be emitted, include additional reference info
+features: [Temporal]
+---*/
+
+const pmd = new Temporal.PlainMonthDay(10, 31, "iso8601", 2019);
+
+assert.sameValue(
+  pmd.toString({ calendarName: 'always' }),
+  "2019-10-31[u-ca=iso8601]",
+  "emit year-month-day if calendarName = 'always' (four-argument constructor)"
+);
+
+const anotherPMD = Temporal.PlainMonthDay.from("2019-10-31"); // 2019 will get dropped
+
+assert.sameValue(
+  anotherPMD.toString({ calendarName: 'always' }),
+  "1972-10-31[u-ca=iso8601]",
+  "emit fallback year if calendarName = 'always' (static from)"
+);

test/built-ins/Temporal/PlainYearMonth/calendar-always.js

@@ -0,0 +1,24 @@
+// 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
+description: If calendar name is to be emitted, include additional reference info
+features: [Temporal]
+---*/
+
+const pym = new Temporal.PlainYearMonth(2019, 10, "iso8601", 31);
+
+assert.sameValue(
+  pym.toString({ calendarName: 'always' }),
+  "2019-10-31[u-ca=iso8601]",
+  "emit year-month-day if calendarName = 'always' (four-argument constructor)"
+);
+
+const anotherPYM = Temporal.PlainYearMonth.from("2019-10-31"); // 31 will get dropped
+
+assert.sameValue(
+  anotherPYM.toString({ calendarName: 'always' }),
+  "2019-10-01[u-ca=iso8601]",
+  "emit fallback day if calendarName = 'always' (static from)"
+);