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Fix parameter order for _by() variants of min / max/ minmax in std::cmp #139357

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@miried miried commented Apr 4, 2025

We saw a regression introduced in version 1.86 that seems to be coming from switching the order of v1 and v2 when calling comparison functions in min_by / max_by / minmax_by (cf. this PR: #136307)

When the compare function is not symmetric in the arguments, this leads to false results. Apparently, the test cases do not cover this scenario currently. While asymmetric comparison may be an edge case, but current behavior is unexpected nevertheless.

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rustbot commented Apr 4, 2025

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 4, 2025
@miried miried changed the title Fix parameter order for _by() variants of min / max/ minmax i… Fix parameter order for _by() variants of min / max/ minmax in std::cmp Apr 4, 2025
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