Proposal: Change the signature of mkWeakMVar

[John Lato]

I find it hard to believe that users who understand weak refs would have
trouble understanding this class, but that's fine. If you think a bunch of
monomorphic variants are better I don't want to argue the point.

It's a definite need though, since otherwise users have to define these by
hand, so +1.

Could we also please add versions for the stm types? I've needed at least
one of them in the past.
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