Migrate Unicode Extension Keywords to ShortVec and improve macro #2191
Labels
C-locale
Component: Locale identifiers, BCP47
good first issue
Good for newcomers
help wanted
Issue needs an assignee
S-medium
Size: Less than a week (larger bug fix or enhancement)
T-enhancement
Type: Nice-to-have but not required
Forked from #1800 to cover Unicode extension keywords.
We should be able to write:
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