[tautschnig]

POSIX.1-2024: uselocale sets the calling thread's locale unless its argument is (locale_t)0, and returns the locale in effect before, which is LC_GLOBAL_LOCALE at first. libc++ switches to its "C" locale with it (__libcpp_locale_guard) around the C library's formatting in num_put; it had no model. New test uselocale.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.02%. Comparing base (826c1c7) to head (8b423d2).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9441      +/-   ##
===========================================
- Coverage    81.02%   81.02%   -0.01%     
===========================================
  Files         1723     1723              
  Lines       191314   191314              
  Branches        73       73              
===========================================
- Hits        155020   155017       -3     
- Misses       36294    36297       +3     

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