Minor containers API changes

Edward Z. Yang ezyang at MIT.EDU
Sun Dec 4 18:37:29 CET 2011

Excerpts from Felipe Almeida Lessa's message of Sun Dec 04 08:06:36 -0500 2011:
> Which ones?  The Ord instance of 'Reverse (Reverse k)'s should be the
> same as that of 'k', right?  Other than that, what invariants could be
> broken?

Yes, Reverse (Reverse k)) should be functionally equal to k, but that's
not what reverse' was doing, was it? ;-)


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