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chore(group_theory/submonoid/operations): use coercion instead of .val #6514

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@eric-wieser eric-wieser commented Mar 3, 2021

lemmas are generally phrased about coercions, so in the unlikely even this is unfolded, the former is more likely to be useful.


Split from #6509.

This seemingly harmless changes causes a timeout in analysis/normed_space/hahn_banach.lean.
While obviously there's minimal gain to merging this PR as is, I think there's probably something library-note worthy to be learnt about this failure.

Zulip

lemmas are generally phrased about coercions, so in the unlikely even this is unfolded, the former is more likely to be useful.
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