[Merged by Bors] - feat(Data/Polynomial/Expand): add leadingCoeff_expand and monic_expand_iff
#9261
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Co-authored-by: Junyan Xu <junyanxu.math@gmail.com>
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…pand_iff` (#9261) The first states that `expand` preserves leading coefficient; the second states that `expand` preserves monicity, hence gives a converse to `Monic.expand`.
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leadingCoeff_expand and monic_expand_iffleadingCoeff_expand and monic_expand_iff
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The first states that
expandpreserves leading coefficient; the second states thatexpandpreserves monicity, hence gives a converse toMonic.expand.Split from #9041, existing discussions: #9041 (comment) #9041 (comment)