> a) ... to use Maybe > b) ... to provide my own Data.Heap.View type
leave the choice up to the programmer, and provide a generic interface, accepting any MonadZero (*) instance. cf. Data.Set.maxView http://www.haskell.org/hoogle/?hoogle=maxView (*) ah - I forgot, MonadZero didn't quite make it, instead we have "fail" in Monad, and "mzero" in MonadPlus. Sure there must have been a reason for this...
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