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Hello internals,
I know now that some of you are swamped getting ready for 8.4, so I want to be clear that this will
be an 8.5+ thing. I am simply sending it to the list in case anyone wants to discuss it, burn it
with fire, give it a gold star, or ignore until later.
Currently, a WeakMap may only have object keys, and this logically makes a lot of sense. However,
there are cases where you want to reference an object by a value but if the value is no longer
referenced, no longer need it. A good example of this might be used in dependency injection
containers, lookup tables for value objects, etc.
I'd like to propose a ReverseWeakMap where the keys must be scalar, and given an object as the
value. Once the value is no longer referenced, the key and value is removed from the ReverseWeakMap.
— Rob