mathlib4
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chore(Mathlib/Algebra/BigOperators/Basic): unscope `∑ x ∈ s, f x` notations
https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Unscoping.20big.20operators
Also, we change the notation for CategoryTheory.Limits.piObj from ∏ f to ∏ᶜ f.