Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-01-06 07:55 69521729

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feat(data/nat/digits): digits_len (#11187) Via a new data.nat.log import. Also unprivate digits_eq_cons_digits_div. The file needs a refactor to make the names more mathlib-like, otherwise I would have named it length_digits.

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