Converts all upper case ASCII letters to lower case ASCII letters, with semantics that exactly match funcGLib.ascii_tolower.
a string
length of str in bytes, or -1 if str is nul-terminated
a newly-allocated string, with all the upper case characters in str converted to lower case. (Note that this is unlike the old funcGLib.strdown, which modified the string in place.)
Converts all upper case ASCII letters to lower case ASCII letters, with semantics that exactly match funcGLib.ascii_tolower.