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Our test driver unsets all LC_* variables as well as LANGUAGE, and
it sets LANG=C, to make errors show up as
set_color: Unknown color 'reset'
rather than
set_color: Unknown color “reset”
It also sets LC_CTYPE which is hardly necessary since c8001b5023
(encoding: use UTF-8 everywhere, 2025-10-18).
The only place where we need it seems to be the use of GNU sed as
called in tests/checks/sphinx-markdown-changelog.fish.
In future we might want to avoid these issues by setting LANG=C.UTF-8
in the test_driver again.