- Remove no longer needed noStrict flags.
- Change tests to use propertyHelper.js for strict mode compatibility.
- Add tests for return value of `delete` operator, e.g. `delete Array.prototype === false`.
- Add non-writable tests for global NaN property.
- Split some tests to run in strict mode.
- Change tests with global `var length` declaration to use a different variable name for browser environments.
- Merge duplicated tests symbol-data-property-configurable-non-strict and symbol-data-property-configurable-strict.
- Merge duplicated tests symbol-data-property-writable-non-strict and symbol-data-property-writable-strict.
- (And a small change in propertyHelper to reduce code duplication in function call.)
- Add missing "var" declarations and noStrict flags
- Move code which requires non-strict semantics from Array.prototype.find_this-arg.js to Array.prototype.find_this-arg-receiver-primitive.js
- Remove duplicate code from Array.prototype.findIndex_this-arg.js, already present in Array.prototype.findIndex_this-arg-receiver-primitive.js
- Remove test code from Array.of_assignment-to-new-object-length.js, does not work in strict mode
Part of issue #35