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Numeric keys larger than 2**24 - 2*20 + 1 are given as the empty string #87

Description

@bakkot

Consider the following program:

let obj = {
  [2**24 - 2**20]: 0,
};

let obj2 = {
  [2**24 - 2**20 + 1]: 0,
};


function isEmptyKey(thing) {
  let keys = Reflect.ownKeys(thing);
  if (keys.length !== 1) throw 'too many keys';
  console.log(keys[0] === '');
}

isEmptyKey(obj);
isEmptyKey(obj2);

This prints false, true. In every other engine, and per the spec, it should be false, false. (No one ever hits the error path; that's just for illustration.)

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