mm-string-make-unibyte
mm-string-make-unibyte is an alias for `string-make-unibyte' in `mm-util.el
'.
(mm-string-make-unibyte STRING)
Return the unibyte equivalent of STRING.
Multibyte character codes are converted to unibyte according to
`nonascii-translation-table' or, if that is nil, `nonascii-insert-offset'.
If the lookup in the translation table fails, this function takes just
the low 8 bits of each character.