Simple maps/sets: parameterize the comparator?

Andreas Rossberg rossberg at
Mon Jan 2 03:54:20 PST 2012

On 29 December 2011 18:48, Allen Wirfs-Brock <allen at> wrote:
> The existence of WeakMap/Map implies the
> existence of an internal object identify hash value.

Why? AFAICT, there is nothing currently requiring these collections to
be implemented as hash tables in particular. And there may perhaps be
reasons for an implementation not to (hash tables tend to be vastly
overused anyway). I would prefer not to hard-code that as a


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