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Author: David Bremner <email@example.com>
Date: Sat Nov 25 08:33:52 2023 -0400
lib/string_map: simulate stable sorting
qsort(3) does not promise stability, and recent versions of glibc have
been showing more unstable behaviour . Michael Gruber observed  test
breakage due to changing output order for message properties.
We provide a sorting order of (key,value) pairs that _looks_ stable by
breaking ties based on value if keys are equal. Internally there may
be some instability in the case of duplicate (key,value) pairs, but it
should not be observable via the iterator API.