WeakMap vs Map

[syarul]

I want to ask. Is there are reasons to fallback to Map when WeakMap is not available?

hookuspocus/src/core.js

Line 1 in d77f0b4

const runMap = window.___hookusPocusRunMap || new (WeakMap || Map)();

hookuspocus/src/core.js

Line 7 in d77f0b4

export const dataMap = runMap.d || new (WeakMap || Map)();

The way I see it Map won't accept objects as keys. There's an alternative to WeakMap if it's not available by using polyfill weakmap-polyfill by @polygonplanet