Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-09-25 21:25 74f6e95c

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feat(data/real/ennreal): make of_real_sub easier to rewrite with (#16621) A tiny edit to make this lemma more general for the purpose of rewriting - previously q was only for nnreal (even though it had the assumption of nonnegativity).

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