ReaderT instances for Semialign and Align #196
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Solves part of #135. In #135 (comment), you say:
Is it sufficient to add one monomorphic test case for |
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Since
ReaderT r m ais isomorphic toCompose m ((->) r)) a, it has a straightforwardAligninstance. This PR adds it. If you want, I can add other instances for transformers that are also compositions (ExceptT,MaybeT, possibly others?).