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icu4x
sffc
sffc commented Mar 18, 2022

In #1694 I added is_ascii_lowercase() (and uppercase and titlecase). The functions are defined to mean that if you apply to_ascii_lowercase() (or uppercase/titlecase), then you get back the same string.

However, many call sites are ending up looking like

s.is_ascii_alphabetic() && s.is_ascii_lowercase()

I think we should add functions that combine both checks and save a

T-enhancement good first issue C-locale A-performance

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