- not exactly covered, but language/expressions/addition/order-of-evalution.js does it for ToNumber vs ToPrimitive checks
- language/expressions/addition/
- Should check for primitive coercion converting values to primitive to be used before comparing to symbol values
- https://tc39.github.io/ecma262/#sec-addition-operator-plus checks for both operands as their primitive values before ToNumber over Symbol values
- should cover ToPrimitive before ToNumber
- allow-math-ic-b3-code-duplication.js:
- Could add cases for addition expressions with primitive operations returning other objects, not really like this specific test, but from @@toPrimitive, valueOf, and toString calls.
- apply-second-argument-must-be-array-like.js
- Cases should be covered in Function#apply, where the second arg is not an array like value
- arguments-bizarre-behavior.js
- This is partially covered in a different way: needs to check length of arguments after defineProperty, and checking after the function escope, as a returned result. Enumerability might be a point to consider as well (too specific?)
- arith-*-on-varios-types.js
- Test262 needs several tests for the Math methods with type coercions on the given arguments
- array-*:
- Perhaps: add cases of operations on top of proxies object to arrays.
