Merge pull request #1281 from cxielarko/bigint-bool-eq

ToPrimitive called without hint for boolean equality

test/language/expressions/equals/to-prim-hint.js

@@ -0,0 +1,35 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-abstract-equality-comparison
+description: Object operands coerced without ToPrimitive hint
+info: >
+  7.2.14 Abstract Equality Comparison
+
+  ...
+  6. If Type(x) is Boolean, return the result of the comparison !
+  ToNumber(x) == y.
+  7. If Type(y) is Boolean, return the result of the comparison x == !
+  ToNumber(y).
+  8. If Type(x) is either String, Number, or Symbol and Type(y) is
+  Object, return the result of the comparison x == ToPrimitive(y).
+  9. If Type(x) is Object and Type(y) is either String, Number, or
+  Symbol, return the result of the comparison ToPrimitive(x) == y.
+  ...
+features: [Symbol.toPrimitive]
+---*/
+
+let count = 0;
+let obj = {
+  [Symbol.toPrimitive](hint) {
+    count += 1;
+    assert.sameValue(hint, "default");
+    return 1;
+  }
+};
+
+assert.sameValue(true == obj, true);
+assert.sameValue(count, 1);
+assert.sameValue(obj == true, true);
+assert.sameValue(count, 2);