feat: add Decidable linter
#10235
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feat: add Decidable linter
#10235
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Found by a linter from #10235.
- Assume `{ι : Sort*} [Countable ι]`
instead of `{ι : Type*} [Encodable ι]`.
- Generalize 2nd Baire theorem from T₂ to R₁.
- Rename type variables.
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Found by a WIP linter in #10235
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Encodable/Countable#10250[Finite ι]instead of[Fintype ι]#10251DecidableEqassumptions #10253DecidableEqassumptions #10254DecidableEqassumptions #10255[Fintype _]->[Finite _]#10257Fintypeassumption #10261