Based on my understanding of the docs (here and here) one would need a reference to the memory address for it to work:

const foo = {};
const map = new Map();
map.set(foo,'123');  // Can only be done if memory address of `foo` is known. Any other shimming would require stringification of foo

This is because JavaScript object {} keys can only be strings (at least in ES5).

Yet I see Map shim being available : https://github.com/zloirock/core-js#map. I tried reading the source but its too neatly abstracted (internally uses strong collection which then imports 10 more files)

Question

Answer any of the following please

• Is there a simple trick to it and can it truly even be done (without stringification)?
• Perhaps it mutates foo to store some string on it and then uses that as the key?
• Something else and maybe I am reading the docs wrong?