Monoid subclasses #56
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The implementations of these instances are inspired by the ones from `Data.Map.Lazy`.
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Has anyone had a chance to look at this? |
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Stacked on top of #55, so you can merge that first in case you want to ship that before a release with new features.
reflex-frp/patch#44 is the grand plan to get
patch-ish things offDecideablyEmptyand useMonoidNullfrommonoid-subclasses. Since this PR adds the dep anyway, I filled out all the lawful instances that I could.Note that there's no instance for
LeftGCDMonoid (DMap k f); unlikecontainers,dependent-mapdoes not provide amergeWithKeyfunction. I can add one, if you'd like, and add the instance in this PR.