[Merged by Bors] - chore: remove workarounds for lean4#1891 #9290
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We no longer need to explicitly specify the
Monotone
andStrictMono
arguments, after leanprover/lean4@069873d fixed leanprover/lean4#1891.Compare to the mathlib3 declarations:
https://github.com/leanprover-community/mathlib/blob/65a1391a0106c9204fe45bc73a039f056558cb83/src/data/prod/lex.lean#L93-L107