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feat:
FastSubsingleton
and FastIsEmpty
to speed up congr!
/`conv…
…ert` (#12495) This is a PR that's a temporary measure to improve performance of `congr!`/`convert`, and the implementation may change in a future PR with a new version of `congr!`. Introduces two typeclasses that are meant to quickly evaluate in common cases of `Subsingleton` and `IsEmpty`. Makes `congr!` use these typeclasses rather than `Subsingleton`. Local `Subsingleton`/`IsEmpty` instances are included as `Fast` instances. To get `congr!`/`convert` to reason about subsingleton types, you can add such instances to the local context. Or, you can `apply Subsingleton.elim` yourself. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/convert.20is.20often.20slow/near/433830798)
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