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Investigate whether re-encoding MultiIndex levels is beneficial #27498

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@qwhelan

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@qwhelan

Follow up for #27495, where we handle the common case of MultiIndex being created from helper functions that ensure the levels are sorted. In order to handle the case of MultiIndex(codes=..., labels=...) and labels being individually unsorted, we likely need to re-encode that level. If that is performant, it would allow deleting a non-performant base case in MultiIndex.is_monotonic

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