I was thinking something like Number.prototype.toString = () => ''; let a = ''; Although I always forget which side gets coerced (this would assume t

I was thinking something like Number.prototype.toString = () => ''; let a = ''; Although I always forget which side gets coerced (this would assume the right-hand side does). I like the side-effect approach, though — seems more nuanced and probably what they were looking for.