Jonathan Brouwer
6bf2ce0f38
Promote `char::is_case_ignorable` from perma-unstable to unstable (Take two of https://github.com/rust-lang/rust/pull/154658, which was closed when GitHub Codespaces somehow managed to squash the entire commit history of rust-lang/rust into one commit) This function is currently used in the implementation of `str::to_lowercase()`. There is no reason to restrict it to the stdlib, though. Reimplementations of string casing for types other than `str` -> `String` shouldn't need to waste space with a duplicate copy of this table. @rustbot label A-unicode T-libs-api r? @Mark-Simulacrum
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