[Merged by Bors] - feat: AddMonoidWithOne, AddGroupWithOne
#206
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Counterpart to leanprover-community/mathlib#12182. Solves the performance issues with polymorphic numerals from #177, as well as the diamonds with Nat. A noteworthy feature is that after importing mathlib, the coercion `ℕ → ℤ` changes from `Int.ofNat` to `Nat.cast`.
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AddMonoidWithOne, AddGroupWithOneAddMonoidWithOne, AddGroupWithOne
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`Int.cast_Nat_cast` dates back to the ad-hoc port, in #206.
uniwuni
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`Int.cast_Nat_cast` dates back to the ad-hoc port, in #206.
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`Int.cast_Nat_cast` dates back to the ad-hoc port, in #206.
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`Int.cast_Nat_cast` dates back to the ad-hoc port, in #206.
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Counterpart to leanprover-community/mathlib#12182. Solves the performance issues with polymorphic numerals from #177, as well as the diamonds with Nat.
A noteworthy feature is that after importing mathlib, the coercion
ℕ → ℤchanges fromInt.ofNattoNat.cast.