uc
Converts a string to uppercase.
Returns an uppercased copy of STRING. For ASCII input, an in-place
byte mutation fast path avoids allocation when a TARG pad slot is
available. For Unicode input, Rust’s to_uppercase() is used, which
handles case mappings that change byte length (e.g. the German
sharp-s \u{00DF} becomes "SS").
Synopsis
$upper = uc($string);
$upper = uc('hello'); # "HELLO"