diff --git a/test/built-ins/TypedArrayConstructors/internals/Set/BigInt/key-is-valid-index-prototype-chain-set.js b/test/built-ins/TypedArrayConstructors/internals/Set/BigInt/key-is-valid-index-prototype-chain-set.js
new file mode 100644
index 00000000000..15b80e4f97c
--- /dev/null
+++ b/test/built-ins/TypedArrayConstructors/internals/Set/BigInt/key-is-valid-index-prototype-chain-set.js
@@ -0,0 +1,87 @@
+// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-integer-indexed-exotic-objects-set-p-v-receiver
+description: >
+  If receiver is altered, OrdinarySet result is returned for valid indices.
+  Value is not coerced.
+info: |
+  [[Set]] ( P, V, Receiver )
+
+  [...]
+  2. If Type(P) is String, then
+    a. Let numericIndex be ! CanonicalNumericIndexString(P).
+    b. If numericIndex is not undefined, then
+      [...]
+  3. Return ? OrdinarySet(O, P, V, Receiver).
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray, Proxy]
+---*/
+
+var valueOfCalls = 0;
+var value = {
+  valueOf: function() {
+    ++valueOfCalls;
+    return 2n;
+  },
+};
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var target, receiver;
+
+  Object.defineProperty(TA.prototype, 0, {
+    get: function() { throw new Test262Error("0 getter should be unreachable!"); },
+    set: function(_v) { throw new Test262Error("0 setter should be unreachable!"); },
+    configurable: true,
+  });
+
+
+  target = new TA([0n]);
+  receiver = Object.create(target);
+  receiver[0] = value;
+  assert.sameValue(target[0], 0n, "target[0] should remain unchanged (receiver: empty object)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be updated (receiver: empty object)");
+
+
+  var proxyTrapCalls = 0;
+  target = new TA([0n]);
+  receiver = new Proxy(Object.create(target), {
+    defineProperty(_target, key, desc) {
+      ++proxyTrapCalls;
+      Object.defineProperty(_target, key, desc);
+      return true;
+    },
+  });
+  receiver[0] = value;
+  assert.sameValue(target[0], 0n, "target[0] should remain unchanged (receiver: proxy of an empty object)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be created (receiver: proxy of an empty object)");
+  assert.sameValue(proxyTrapCalls, 1, "Proxy's [[DefineOwnProperty]] exotic method should be called");
+
+
+  target = new TA([0n]);
+  receiver = Object.preventExtensions(Object.create(target));
+  assert.throws(TypeError, function() { "use strict"; receiver[0] = value; },
+    "setting receiver[0] should throw in strict mode (receiver: non-extensible empty object)");
+  assert.sameValue(target[0], 0n, "target[0] should remain unchanged (receiver: non-extensible empty object)");
+  assert(!receiver.hasOwnProperty(0), "receiver[0] should not be created (receiver: non-extensible empty object)");
+
+
+  target = new TA([0n]);
+  receiver = Object.setPrototypeOf([], target);
+  receiver[0] = value;
+  assert.sameValue(target[0], 0n, "target[0] should remain unchanged (receiver: regular array)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be created (receiver: regular array)");
+  assert.sameValue(receiver.length, 1, "Array's [[DefineOwnProperty]] exotic method should be called");
+
+
+  target = new TA([0n]);
+  receiver = Object.setPrototypeOf(new String(""), target);
+  receiver[0] = value;
+  assert.sameValue(target[0], 0n, "target[0] should remain unchanged (receiver: empty String object)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be created (receiver: empty String object)");
+
+
+  assert(delete TA.prototype[0]);
+});
+
+assert.sameValue(valueOfCalls, 0, "value should not be coerced");
diff --git a/test/built-ins/TypedArrayConstructors/internals/Set/key-is-valid-index-prototype-chain-set.js b/test/built-ins/TypedArrayConstructors/internals/Set/key-is-valid-index-prototype-chain-set.js
new file mode 100644
index 00000000000..38165490541
--- /dev/null
+++ b/test/built-ins/TypedArrayConstructors/internals/Set/key-is-valid-index-prototype-chain-set.js
@@ -0,0 +1,87 @@
+// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-integer-indexed-exotic-objects-set-p-v-receiver
+description: >
+  If receiver is altered, OrdinarySet result is returned for valid indices.
+  Value is not coerced.
+info: |
+  [[Set]] ( P, V, Receiver )
+
+  [...]
+  2. If Type(P) is String, then
+    a. Let numericIndex be ! CanonicalNumericIndexString(P).
+    b. If numericIndex is not undefined, then
+      [...]
+  3. Return ? OrdinarySet(O, P, V, Receiver).
+includes: [testTypedArray.js]
+features: [TypedArray, Proxy]
+---*/
+
+var valueOfCalls = 0;
+var value = {
+  valueOf: function() {
+    ++valueOfCalls;
+    return 2.3;
+  },
+};
+
+testWithTypedArrayConstructors(function(TA) {
+  var target, receiver;
+
+  Object.defineProperty(TA.prototype, 0, {
+    get: function() { throw new Test262Error("0 getter should be unreachable!"); },
+    set: function(_v) { throw new Test262Error("0 setter should be unreachable!"); },
+    configurable: true,
+  });
+
+
+  target = new TA([0]);
+  receiver = Object.create(target);
+  receiver[0] = value;
+  assert.sameValue(target[0], 0, "target[0] should remain unchanged (receiver: empty object)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be updated (receiver: empty object)");
+
+
+  var proxyTrapCalls = 0;
+  target = new TA([0]);
+  receiver = new Proxy(Object.create(target), {
+    defineProperty(_target, key, desc) {
+      ++proxyTrapCalls;
+      Object.defineProperty(_target, key, desc);
+      return true;
+    },
+  });
+  receiver[0] = value;
+  assert.sameValue(target[0], 0, "target[0] should remain unchanged (receiver: proxy of an empty object)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be created (receiver: proxy of an empty object)");
+  assert.sameValue(proxyTrapCalls, 1, "Proxy's [[DefineOwnProperty]] exotic method should be called");
+
+
+  target = new TA([0]);
+  receiver = Object.preventExtensions(Object.create(target));
+  assert.throws(TypeError, function() { "use strict"; receiver[0] = value; },
+    "setting receiver[0] should throw in strict mode (receiver: non-extensible empty object)");
+  assert.sameValue(target[0], 0, "target[0] should remain unchanged (receiver: non-extensible empty object)");
+  assert(!receiver.hasOwnProperty(0), "receiver[0] should not be created (receiver: non-extensible empty object)");
+
+
+  target = new TA([0]);
+  receiver = Object.setPrototypeOf([], target);
+  receiver[0] = value;
+  assert.sameValue(target[0], 0, "target[0] should remain unchanged (receiver: regular array)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be created (receiver: regular array)");
+  assert.sameValue(receiver.length, 1, "Array's [[DefineOwnProperty]] exotic method should be called");
+
+
+  target = new TA([0]);
+  receiver = Object.setPrototypeOf(new String(""), target);
+  receiver[0] = value;
+  assert.sameValue(target[0], 0, "target[0] should remain unchanged (receiver: empty String object)");
+  assert.sameValue(receiver[0], value, "receiver[0] should be created (receiver: empty String object)");
+
+
+  assert(delete TA.prototype[0]);
+});
+
+assert.sameValue(valueOfCalls, 0, "value should not be coerced");