[Merged by Bors] - fix(algebra/group/units): add missing coe lemmas to units #3472
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alexpeattie
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Per @kbuzzard's suggestions [here](https://leanprover-community.github.io/archive/stream/113489-new-members/topic/Shortening.20proof.20on.20product.20of.20units.20in.20Z.html#204406319): - Add a new lemma `coe_eq_one` to `units` API - Tag `eq_iff` with `norm_cast`
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Per @kbuzzard's suggestions [here](https://leanprover-community.github.io/archive/stream/113489-new-members/topic/Shortening.20proof.20on.20product.20of.20units.20in.20Z.html#204406319): - Add a new lemma `coe_eq_one` to `units` API - Tag `eq_iff` with `norm_cast` Co-authored-by: Johan Commelin <johan@commelin.net>
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Follow up to #3472 - adds `coe_neg_one`, which allows `norm_cast` to handle hypotheses like `↑-1 = 1`
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Per @kbuzzard's suggestions here:
coe_eq_onetounitsAPIeq_iffwithnorm_cast