Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
0b54a76e32
This PR generalizes the typeclass assumptions on monadic `Option` functions. `Option.mapA` is now an alias for `Option.mapM`, which now works for applicative functors. The changed definition is exactly equivalent for monads which use the default implementation of `map`, and those who change it will hopefully choose a definition for `map` that is more efficient and not less efficient. `Option.mapA` is not deprecated in order to keep the API aligned with `List` (`List.mapA` and `List.mapM` cannot be unified because the monadic version is much more efficient than the applicative version). |
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