[Merged by Bors] - chore(algebra/group/units): is_add_unit.decidable #18439
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Missing
to_additive
I had actually added this to mathlib4 3 months ago in leanprover-community/mathlib4@cbc0834 (leanprover-community/mathlib4#549), and never noticed it wasn't in mathlib3.
mathlib4 hash-update placeholder pr: leanprover-community/mathlib4#2278