Stringprep_profile_flags STRINGPREP_NO_NFKC
Disable the NFKC normalization, as well as selecting the non-NFKC case
folding tables. Usually the profile specifies BIDI and NFKC settings,
and applications should not override it unless in special situations.
Stringprep_profile_flags STRINGPREP_NO_BIDI
Disable the BIDI step. Usually the profile specifies BIDI and NFKC
settings, and applications should not override it unless in special
situations.
Stringprep_profile_flags STRINGPREP_NO_UNASSIGNED
Make the library return with an error if string contains unassigned
characters according to profile.