string-downcase

(string-downcase string-designator)

Returns a new string with every uppercase letter converted to lowercase; the original string is unchanged. The argument is a string designator, so a symbol or keyword is also accepted -- its name is used and a keyword's leading colon is dropped, so (string-downcase :FOO) returns "foo". In the WASM backend case conversion is ASCII-only, so only the letters A-Z are affected and non-ASCII characters pass through untouched.