BIT_CTYPE_ALNUM  1120 enc/mktable.c      if (IsAlpha (enc, c))   val |= (BIT_CTYPE_ALPHA | BIT_CTYPE_ALNUM);
BIT_CTYPE_ALNUM  1123 enc/mktable.c      if (IsDigit (enc, c))   val |= (BIT_CTYPE_DIGIT | BIT_CTYPE_ALNUM);