Weak Maps seems to have superseded ephemeron tables.
They are non-enumerable, does this also exclude any call that gives you
an array of the current keys?
If this is the case then it excludes the primary use case we have in
node for ephemeron tables.
I can understand why you might want to limit enumerability because a gc
could mutate the map during enumeration but I desperately hope there is
still a way to get the current list of keys and inspect the values
provided that you guard against the key going away.
-Mikeal
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