add ListT monad transformer and relevant instances #66
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Relevant issue: #54
Don't merge yet, some unresolved questions:
Enumerator
part of theListT
API frompipes
? I have not done so here.exceptions
to provideMonadCatch
andMonadThrow
instances forListT
? There seems to already be the desire to incur this dependency onexceptions
in issue [Discussion] Should we bring back exceptions instances? #52.ListT
, or should it be something else?