rawToProxy WeakMap.set is never called

[NesCafe62]

was reading through the code to see how observable is implemented with proxies. I saw this line https://github.com/nx-js/observer-util/blob/master/src/handlers.js#L28 and thought rawToProxy should work as a cache to avoid recreating proxy if some nested property is accessed multiple times. but after search by rawToProxy I could not find any set call.

I understand that it only affects perfomance but not affect the correcntess of behavior

edit: seems same is for proxyToRaw