feat: allow EStateM to be used polymorphically
#3010
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This doesn't change `IO` or `ST`, but does enable downstream projects like `Mathlib` to use `EStateM` for their own purposes with full universe polymorphism. The alternative is defining an entire copy of EStateM, which is a lot of boilerplate.
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eric-wieser
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Dec 1, 2023
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As far as I can tell this is just a permutation
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This doesn't change
IOorST, but does enable downstream projects likeMathlibto useEStateMfor their own purposes with full universe polymorphism.The alternative is defining an entire copy of
EStateM, which is a lot of boilerplate.Notably, the generalized
EStateM.mapcan be invoked (in the non-monadic spelling) withULift.upto move between universes.Summary
Link to
RFCorbugissue: this is a prerequisite for #3011, but may be justified in its own right.