rb_enc_isctype   2674 string.c           if (rb_enc_isctype(c, ONIGENC_CTYPE_DIGIT, enc))
rb_enc_isctype   2676 string.c           else if (rb_enc_isctype(c, ONIGENC_CTYPE_ALPHA, enc))
rb_enc_isctype   2685 string.c               if (rb_enc_isctype(c, ctype, enc))
rb_enc_isctype   2695 string.c                   if (!rb_enc_isctype(c, ctype, enc)) {