[libcxx-commits] [libcxx] [libc++] Make sure `flat_{multi}map::key_compare` handle `boolean-testable` correctly (PR #132621)

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huixie90 wrote:

thanks for the patch. if you are not familiar with libc++ tests, i can certainly help with the testing for this patch. let me know if you want me to add the test to your branch 

https://github.com/llvm/llvm-project/pull/132621