Fix copyrights and features metadata

features.txt

@@ -249,6 +249,10 @@ Temporal
 # https://github.com/tc39/proposal-realms
 callable-boundary-realms
 
+# Array.prototype.findLast & Array.prototype.findLastIndex
+# https://github.com/tc39/proposal-array-find-from-last
+array-find-from-last
+
 ## Standard language features
 #
 # Language features that have been included in a published version of the

test/built-ins/Array/prototype/findLast/array-altered-during-loop.js

@@ -1,10 +1,10 @@
-// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
 description: >
   The range of elements processed is set before the first call to `predicate`.
-info: |
+  info: |
   Array.prototype.findLast ( predicate[ , thisArg ] )
 
   ...
@@ -13,6 +13,7 @@ info: |
   ...
   c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
+features: [array-find-from-last]
 ---*/
 
 var arr = ['Shoes', 'Car', 'Bike'];
@@ -32,7 +33,7 @@ assert.sameValue(results[2], 'Shoes');
 
 results = [];
 arr = ['Skateboard', 'Barefoot'];
-arr.find(function(kValue) {
+arr.findLast(function(kValue) {
   if (results.length === 0) {
     arr.push('Motorcycle');
     arr[1] = 'Magic Carpet';

test/built-ins/Array/prototype/findLast/call-with-boolean.js

@@ -1,9 +1,10 @@
-// Copyright (c) 2021 Rick Waldron.  All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
 esid: sec-array.prototype.findlast
-description: Array.prototype.findLast applied to boolean primitive
+description: Array.prototype.findLast applied to boolean primitive.
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLast/length.js

@@ -1,11 +1,12 @@
-// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
 description: Array.prototype.findLast.length value and descriptor.
 info: |
-  17 ECMAScript Standard Built-in Objects
+17 ECMAScript Standard Built-in Objects
 includes: [propertyHelper.js]
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLast/name.js

@@ -1,15 +1,16 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
 description: >
   Array.prototype.findLast.name value and descriptor.
-info: |
+  info: |
   Array.prototype.findLast ( predicate [ , thisArg ] )
 
   17 ECMAScript Standard Built-in Objects
 
 includes: [propertyHelper.js]
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLast/not-a-constructor.js

@@ -1,10 +1,10 @@
-// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
 esid: sec-ecmascript-standard-built-in-objects
 description: >
-  Array.prototype.findLast does not implement [[Construct]], is not new-able
+  Array.prototype.findLast does not implement [[Construct]], is not new-able.
 info: |
   ECMAScript Function Objects
 
@@ -18,7 +18,7 @@ info: |
   7. If IsConstructor(constructor) is false, throw a TypeError exception.
   ...
 includes: [isConstructor.js]
-features: [Reflect.construct, arrow-function]
+features: [Reflect.construct, arrow-function, array-find-from-last]
 ---*/
 
 assert.sameValue(isConstructor(Array.prototype.findLast), false, 'isConstructor(Array.prototype.findLast) must return false');

test/built-ins/Array/prototype/findLast/predicate-call-parameters.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -14,6 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     d. If testResult is true, return kValue.
   ...
+features: [array-find-from-last]
 ---*/
 
 var arr = ['Mike', 'Rick', 'Leo'];

test/built-ins/Array/prototype/findLast/predicate-call-this-non-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -14,6 +14,7 @@ info: |
     d. If testResult is true, return kValue.
   ...
 flags: [noStrict]
+features: [array-find-from-last]
 ---*/
 
 var result;

test/built-ins/Array/prototype/findLast/predicate-call-this-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -14,6 +14,7 @@ info: |
     d. If testResult is true, return kValue.
   ...
 flags: [onlyStrict]
+features: [array-find-from-last]
 ---*/
 
 var result;

test/built-ins/Array/prototype/findLast/predicate-called-for-each-array-property.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -13,6 +13,7 @@ info: |
     ...
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
+features: [array-find-from-last]
 ---*/
 
 var arr = [undefined, , , 'foo'];

test/built-ins/Array/prototype/findLast/predicate-is-not-callable-throws.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -10,6 +10,7 @@ info: |
   ...
   3. If IsCallable(predicate) is false, throw a TypeError exception.
   ...
+features: [array-find-from-last]
 ---*/
 
 assert.throws(TypeError, function() {

test/built-ins/Array/prototype/findLast/predicate-not-called-on-empty-array.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -14,6 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
   6. Return undefined.
+features: [array-find-from-last]
 ---*/
 
 var called = false;

test/built-ins/Array/prototype/findLast/prop-desc.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -6,6 +6,7 @@ description: Property type and descriptor.
 info: |
   17 ECMAScript Standard Built-in Objects
 includes: [propertyHelper.js]
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLast/return-abrupt-from-predicate-call.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -14,6 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     d. If testResult is true, return kValue.
   ...
+features: [array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/Array/prototype/findLast/return-abrupt-from-property.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -15,6 +15,7 @@ info: |
     ...
     d. If testResult is true, return kValue.
   ...
+features: [array-find-from-last]
 ---*/
 
 var o = {

test/built-ins/Array/prototype/findLast/return-abrupt-from-this-length-as-symbol.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -10,7 +10,7 @@ info: |
   1. Let O be ? ToObject(this value).
   2. Let len be ? LengthOfArrayLike(O).
 
-features: [Symbol]
+features: [Symbol, array-find-from-last]
 ---*/
 
 var o = {};

test/built-ins/Array/prototype/findLast/return-abrupt-from-this-length.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -9,6 +9,7 @@ info: |
 
   1. Let O be ? ToObject(this value).
   2. Let len be ? LengthOfArrayLike(O).
+features: [array-find-from-last]
 ---*/
 
 var o1 = {};

test/built-ins/Array/prototype/findLast/return-abrupt-from-this.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -8,6 +8,7 @@ info: |
   Array.prototype.findLast ( predicate[ , thisArg ] )
 
   1. Let O be ? ToObject(this value).
+features: [array-find-from-last]
 ---*/
 
 // predicate fn is given to avoid false positives

test/built-ins/Array/prototype/findLast/return-found-value-predicate-result-is-true.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     d. If testResult is true, return kValue.
   ...
-features: [Symbol]
+features: [Symbol, array-find-from-last]
 ---*/
 
 var arr = ['Shoes', 'Car', 'Bike'];

test/built-ins/Array/prototype/findLast/return-undefined-if-predicate-returns-false-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlast
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     ...
   6. Return undefined.
-features: [Symbol]
+features: [Symbol, array-find-from-last]
 ---*/
 
 var arr = ['Shoes', 'Car', 'Bike'];

test/built-ins/Array/prototype/findLastIndex/array-altered-during-loop.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,6 +13,7 @@ info: |
     ...
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
+features: [array-find-from-last]
 ---*/
 
 var arr = ['Shoes', 'Car', 'Bike'];

test/built-ins/Array/prototype/findLastIndex/call-with-boolean.js

@@ -1,9 +1,10 @@
-// Copyright (c) 2020 Rick Waldron.  All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
 esid: sec-array.prototype.findlastindex
-description: Array.prototype.findLastIndex applied to boolean primitive
+description: Array.prototype.findLastIndex applied to boolean primitive.
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLastIndex/length.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -6,6 +6,7 @@ description: Array.prototype.findLastIndex.length value and descriptor.
 info: |
   17 ECMAScript Standard Built-in Objects
 includes: [propertyHelper.js]
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLastIndex/name.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -10,10 +10,11 @@ info: |
   17 ECMAScript Standard Built-in Objects
 
 includes: [propertyHelper.js]
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(
-  Array.prototype.findIndex.name, 'findLastIndex',
+  Array.prototype.findLastIndex.name, 'findLastIndex',
   'The value of `Array.prototype.findLastIndex.name` is `"findLastIndex"`'
 );
 

test/built-ins/Array/prototype/findLastIndex/not-a-constructor.js

@@ -1,10 +1,10 @@
-// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
 esid: sec-ecmascript-standard-built-in-objects
 description: >
-  Array.prototype.findLastIndex does not implement [[Construct]], is not new-able
+  Array.prototype.findLastIndex does not implement [[Construct]], is not new-able.
 info: |
   ECMAScript Function Objects
 
@@ -18,7 +18,7 @@ info: |
   7. If IsConstructor(constructor) is false, throw a TypeError exception.
   ...
 includes: [isConstructor.js]
-features: [Reflect.construct, arrow-function]
+features: [Reflect.construct, arrow-function, array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLastIndex/predicate-call-parameters.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,6 +13,7 @@ info: |
     ...
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
+features: [array-find-from-last]
 ---*/
 
 var arr = ['Mike', 'Rick', 'Leo'];

test/built-ins/Array/prototype/findLastIndex/predicate-call-this-non-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -14,6 +14,7 @@ info: |
     d. If testResult is true, return 𝔽(k).
   ...
 flags: [noStrict]
+features: [array-find-from-last]
 ---*/
 
 var result;

test/built-ins/Array/prototype/findLastIndex/predicate-call-this-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -14,6 +14,7 @@ info: |
     d. If testResult is true, return 𝔽(k).
   ...
 flags: [onlyStrict]
+features: [array-find-from-last]
 ---*/
 
 var result;

test/built-ins/Array/prototype/findLastIndex/predicate-called-for-each-array-property.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,6 +13,7 @@ info: |
     ...
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
+features: [array-find-from-last]
 ---*/
 
 var arr = [undefined, , , 'foo'];

test/built-ins/Array/prototype/findLastIndex/predicate-is-not-callable-throws.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -10,6 +10,7 @@ info: |
   ...
   3. If IsCallable(predicate) is false, throw a TypeError exception.
   ...
+features: [array-find-from-last]
 ---*/
 
 assert.throws(TypeError, function() {

test/built-ins/Array/prototype/findLastIndex/predicate-not-called-on-empty-array.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,6 +13,7 @@ info: |
     ...
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   6. Return -1.
+features: [array-find-from-last]
 ---*/
 
 var called = false;

test/built-ins/Array/prototype/findLastIndex/prop-desc.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -6,6 +6,7 @@ description: Property type and descriptor.
 info: |
   17 ECMAScript Standard Built-in Objects
 includes: [propertyHelper.js]
+features: [array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/Array/prototype/findLastIndex/return-abrupt-from-predicate-call.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -14,6 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     d. If testResult is true, return 𝔽(k).
   ...
+features: [array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/Array/prototype/findLastIndex/return-abrupt-from-property.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,6 +13,7 @@ info: |
     a. Let Pk be ! ToString(𝔽(k)).
     b. Let kValue be ? Get(O, Pk).
   ...
+features: [array-find-from-last]
 ---*/
 
 var o = {

test/built-ins/Array/prototype/findLastIndex/return-abrupt-from-this-length-as-symbol.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -10,7 +10,7 @@ info: |
   1. Let O be ? ToObject(this value).
   2. Let len be ? LengthOfArrayLike(O).
   ...
-features: [Symbol]
+features: [Symbol, array-find-from-last]
 ---*/
 
 var o = {};

test/built-ins/Array/prototype/findLastIndex/return-abrupt-from-this-length.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -9,6 +9,7 @@ info: |
 
   1. Let O be ? ToObject(this value).
   2. Let len be ? LengthOfArrayLike(O).
+features: [array-find-from-last]
 ---*/
 
 var o1 = {};

test/built-ins/Array/prototype/findLastIndex/return-abrupt-from-this.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -8,6 +8,7 @@ info: |
   Array.prototype.findLastIndex ( predicate[ , thisArg ] )
 
   1. Let O be ? ToObject(this value).
+features: [array-find-from-last]
 ---*/
 
 // predicate fn is given to avoid false positives

test/built-ins/Array/prototype/findLastIndex/return-index-predicate-result-is-true.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     d. If testResult is true, return 𝔽(k).
   ...
-features: [Symbol]
+features: [Symbol, array-find-from-last]
 ---*/
 
 var arr = ['Shoes', 'Car', 'Bike'];

test/built-ins/Array/prototype/findLastIndex/return-negative-one-if-predicate-returns-false-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-array.prototype.findlastindex
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
     ...
   6. Return -1.
-features: [Symbol]
+features: [Symbol, array-find-from-last]
 ---*/
 
 var arr = ['Shoes', 'Car', 'Bike'];

test/built-ins/TypedArray/prototype/findLast/BigInt/detached-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -14,7 +14,7 @@ info: |
   5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
   ...
 includes: [testBigIntTypedArray.js, detachArrayBuffer.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/TypedArray/prototype/findLast/BigInt/get-length-ignores-length-prop.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -11,7 +11,7 @@ info: |
   3. Let len be O.[[ArrayLength]].
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 Object.defineProperty(TypedArray.prototype, "length", {

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-call-changes-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -14,7 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [compareArray.js, testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-call-parameters.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-call-this-non-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
   ...
 flags: [noStrict]
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 var T = this;

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-call-this-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
   ...
 flags: [onlyStrict]
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-is-not-callable-throws.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -11,7 +11,7 @@ info: |
   4. If IsCallable(predicate) is false, throw a TypeError exception.
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-may-detach-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -21,7 +21,7 @@ info: |
     If IsDetachedBuffer(buffer) is true, return undefined.
 
 includes: [testBigIntTypedArray.js, detachArrayBuffer.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/predicate-not-called-on-empty-array.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -12,7 +12,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/return-abrupt-from-predicate-call.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -12,7 +12,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/return-found-value-predicate-result-is-true.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
     d. If testResult is true, return kValue.
     ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, Symbol, TypedArray]
+features: [BigInt, Symbol, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/BigInt/return-undefined-if-predicate-returns-false-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -14,7 +14,7 @@ info: |
     ...
   7. Return undefined.
 includes: [testBigIntTypedArray.js]
-features: [BigInt, Symbol, TypedArray]
+features: [BigInt, Symbol, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/detached-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -14,7 +14,7 @@ info: |
   5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
   ...
 includes: [testTypedArray.js, detachArrayBuffer.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/TypedArray/prototype/findLast/get-length-ignores-length-prop.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -10,7 +10,7 @@ info: |
   3. Let len be O.[[ArrayLength]].
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 Object.defineProperty(TypedArray.prototype, "length", {

test/built-ins/TypedArray/prototype/findLast/invoked-as-func.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -15,7 +15,7 @@ info: |
   exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var findLast = TypedArray.prototype.findLast;

test/built-ins/TypedArray/prototype/findLast/invoked-as-method.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -15,7 +15,7 @@ info: |
   exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var TypedArrayPrototype = TypedArray.prototype;

test/built-ins/TypedArray/prototype/findLast/length.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 André Bargull. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -20,7 +20,7 @@ info: |
     object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
     [[Configurable]]: true }.
 includes: [propertyHelper.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 assert.sameValue(TypedArray.prototype.findLast.length, 1);

test/built-ins/TypedArray/prototype/findLast/name.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 André Bargull. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -17,7 +17,7 @@ info: |
     object, if it exists, has the attributes { [[Writable]]: false,
     [[Enumerable]]: false, [[Configurable]]: true }.
 includes: [propertyHelper.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 assert.sameValue(TypedArray.prototype.findLast.name, "findLast");

test/built-ins/TypedArray/prototype/findLast/not-a-constructor.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -18,7 +18,7 @@ info: |
   7. If IsConstructor(constructor) is false, throw a TypeError exception.
   ...
 includes: [isConstructor.js, testTypedArray.js]
-features: [Reflect.construct, arrow-function, TypedArray]
+features: [Reflect.construct, arrow-function, TypedArray, array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/TypedArray/prototype/findLast/predicate-call-changes-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -14,7 +14,7 @@ info: |
   ...
 
 includes: [compareArray.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/predicate-call-parameters.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/predicate-call-this-non-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
   ...
 flags: [noStrict]
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var T = this;

test/built-ins/TypedArray/prototype/findLast/predicate-call-this-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
   ...
 flags: [onlyStrict]
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/predicate-is-not-callable-throws.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -11,7 +11,7 @@ info: |
   4. If IsCallable(predicate) is false, throw a TypeError exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/predicate-may-detach-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -21,7 +21,7 @@ info: |
     If IsDetachedBuffer(buffer) is true, return undefined.
 
 includes: [testTypedArray.js, detachArrayBuffer.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/predicate-not-called-on-empty-array.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -12,7 +12,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/prop-desc.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findLast
@@ -9,7 +9,7 @@ info: |
   and in Annex B.2 has the attributes { [[Writable]]: true,
   [[Enumerable]]: false, [[Configurable]]: true } unless otherwise specified.
 includes: [propertyHelper.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var TypedArrayPrototype = TypedArray.prototype;

test/built-ins/TypedArray/prototype/findLast/return-abrupt-from-predicate-call.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -12,7 +12,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/return-abrupt-from-this-out-of-bounds.js

@@ -1,10 +1,10 @@
-// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
 description: Return abrupt when "this" value fails buffer boundary checks
 includes: [testTypedArray.js]
-features: [TypedArray, resizable-arraybuffer]
+features: [TypedArray, resizable-arraybuffer, array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/TypedArray/prototype/findLast/return-found-value-predicate-result-is-true.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
     d. If testResult is true, return kValue.
     ...
 includes: [testTypedArray.js]
-features: [Symbol, TypedArray]
+features: [Symbol, TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/return-undefined-if-predicate-returns-false-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -14,7 +14,7 @@ info: |
     ...
   7. Return undefined.
 includes: [testTypedArray.js]
-features: [Symbol, TypedArray]
+features: [Symbol, TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLast/this-is-not-object.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -13,7 +13,7 @@ info: |
   1. If Type(O) is not Object, throw a TypeError exception.
   ...
 includes: [testTypedArray.js]
-features: [Symbol, TypedArray]
+features: [Symbol, TypedArray, array-find-from-last]
 ---*/
 
 var findLast = TypedArray.prototype.findLast;

test/built-ins/TypedArray/prototype/findLast/this-is-not-typedarray-instance.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlast
@@ -16,7 +16,7 @@ info: |
   exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var findlast = TypedArray.prototype.findlast;

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/detached-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -16,7 +16,7 @@ info: |
   5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
   ...
 includes: [testBigIntTypedArray.js, detachArrayBuffer.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/get-length-ignores-length-prop.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -11,7 +11,7 @@ info: |
   3. Let len be O.[[ArrayLength]].
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 Object.defineProperty(TypedArray.prototype, "length", {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-changes-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [compareArray.js, testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-parameters.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -14,7 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-non-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -15,7 +15,7 @@ info: |
   ...
 flags: [noStrict]
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 var T = this;

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -15,7 +15,7 @@ info: |
     ...
 flags: [onlyStrict]
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-is-not-callable-throws.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -11,7 +11,7 @@ info: |
   4. If IsCallable(predicate) is false, throw a TypeError exception.
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-may-detach-buffer.js

@@ -1,5 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
-// Copyright (C) 2021 Apple Inc. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -21,7 +20,7 @@ info: |
     If IsDetachedBuffer(buffer) is true, return undefined.
 
 includes: [testBigIntTypedArray.js, detachArrayBuffer.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-not-called-on-empty-array.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -14,7 +14,7 @@ info: |
     ...
   7. Return -1.
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/return-abrupt-from-predicate-call.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -14,7 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/return-index-predicate-result-is-true.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -15,7 +15,7 @@ info: |
     d. If testResult is true, return 𝔽(k).
   ...
 includes: [testBigIntTypedArray.js]
-features: [BigInt, Symbol, TypedArray]
+features: [BigInt, Symbol, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/BigInt/return-negative-one-if-predicate-returns-false-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -15,7 +15,7 @@ info: |
     ...
   7. Return -1𝔽.
 includes: [testBigIntTypedArray.js]
-features: [BigInt, TypedArray]
+features: [BigInt, TypedArray, array-find-from-last]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/detached-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -16,7 +16,7 @@ info: |
   5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
   ...
 includes: [testTypedArray.js, detachArrayBuffer.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var predicate = function() {

test/built-ins/TypedArray/prototype/findLastIndex/get-length-ignores-length-prop.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -11,7 +11,7 @@ info: |
   3. Let len be O.[[ArrayLength]].
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 Object.defineProperty(TypedArray.prototype, "length", {

test/built-ins/TypedArray/prototype/findLastIndex/invoked-as-func.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -17,7 +17,7 @@ info: |
   exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var findLastIndex = TypedArray.prototype.findLastIndex;

test/built-ins/TypedArray/prototype/findLastIndex/invoked-as-method.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -17,7 +17,7 @@ info: |
   exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var TypedArrayPrototype = TypedArray.prototype;

test/built-ins/TypedArray/prototype/findLastIndex/length.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 André Bargull. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -20,7 +20,7 @@ info: |
     object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
     [[Configurable]]: true }.
 includes: [propertyHelper.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 assert.sameValue(TypedArray.prototype.findLastIndex.length, 1);

test/built-ins/TypedArray/prototype/findLastIndex/name.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2015 André Bargull. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -17,7 +17,7 @@ info: |
     object, if it exists, has the attributes { [[Writable]]: false,
     [[Enumerable]]: false, [[Configurable]]: true }.
 includes: [propertyHelper.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 assert.sameValue(TypedArray.prototype.findLastIndex.name, "findLastIndex");

test/built-ins/TypedArray/prototype/findLastIndex/not-a-constructor.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -18,7 +18,7 @@ info: |
   7. If IsConstructor(constructor) is false, throw a TypeError exception.
   ...
 includes: [isConstructor.js, testTypedArray.js]
-features: [Reflect.construct, arrow-function, TypedArray]
+features: [Reflect.construct, arrow-function, TypedArray, array-find-from-last]
 ---*/
 
 assert.sameValue(

test/built-ins/TypedArray/prototype/findLastIndex/predicate-call-changes-value.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -13,7 +13,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [compareArray.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/predicate-call-parameters.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -14,7 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/predicate-call-this-non-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -15,7 +15,7 @@ info: |
   ...
 flags: [noStrict]
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var T = this;

test/built-ins/TypedArray/prototype/findLastIndex/predicate-call-this-strict.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -15,7 +15,7 @@ info: |
   ...
 flags: [onlyStrict]
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/predicate-is-not-callable-throws.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -11,7 +11,7 @@ info: |
   4. If IsCallable(predicate) is false, throw a TypeError exception.
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/predicate-may-detach-buffer.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -20,7 +20,7 @@ info: |
     If IsDetachedBuffer(buffer) is true, return undefined.
 
 includes: [testTypedArray.js, detachArrayBuffer.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/predicate-not-called-on-empty-array.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -14,7 +14,7 @@ info: |
     ...
   7. Return -1.
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/findLastIndex/prop-desc.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -9,7 +9,7 @@ info: |
   and in Annex B.2 has the attributes { [[Writable]]: true,
   [[Enumerable]]: false, [[Configurable]]: true } unless otherwise specified.
 includes: [propertyHelper.js, testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var TypedArrayPrototype = TypedArray.prototype;

test/built-ins/TypedArray/prototype/findLastIndex/return-abrupt-from-predicate-call.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// Copyright (C) 2021 Microsoft. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: sec-%typedarray%.prototype.findlastindex
@@ -14,7 +14,7 @@ info: |
     c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
   ...
 includes: [testTypedArray.js]
-features: [TypedArray]
+features: [TypedArray, array-find-from-last]
 ---*/
 
 var predicate = function() {