fix: misleading type at Option.forM
#4403
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… `1` Remark: we should probably elaborate `def`s like we elaborate theorems when the resulting type is provided.
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The type uses
PUnit, but thepure ()in the body was forcing the implicit universe level atPUnitto be1.We should probably elaborate
defs like we elaborate theorems when the resulting type is provided. This kind of mistake is hard to spot.