stri_enc_toascii(str)Bytes-marked strings are treated as 8-bit strings.
The SUBSTITUTE CHARACTER (\x1a == \032) may be
interpreted as ASCII missing value for single characters.
stri_conv,
stri_encode;
stri_enc_fromutf32;
stri_enc_toutf32;
stri_enc_toutf8;
stringi-encoding