Minor containers API changes

Edward Z. Yang ezyang at MIT.EDU
Sun Dec 4 18:45:44 CET 2011

Excerpts from Felipe Almeida Lessa's message of Sun Dec 04 12:41:54 -0500 2011:
> It seems I may have missed something then.  It gets a map with keys of
> type 'Reverse k', uses 'reverse' to get 'Reverse (Reverse k)' and then
> unsafeCoerces to 'k'.  Doesn't it?  =)

Ah yes, I seem to have misunderstood the code. Carry on. 8)

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