Use `coerce` instead of `fmap Down`/`fmap unDown`

lspitzner / pqueue

Haskell priority queue package

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Use `coerce` instead of `fmap Down`/`fmap unDown` #130

Closed konsumlamm closed 1 year ago

konsumlamm commented 1 year ago

Closes #97.

The only coerce that actually changes the generated core significantly is the one in mapMaybe, but IMO using coerce makes it clearer that the conversion is free.