STRIO_READABLE    123 ext/stringio/stringio.c #define STRIO_READWRITE (STRIO_READABLE|STRIO_WRITABLE)
STRIO_READABLE    224 ext/stringio/stringio.c     RBASIC(self)->flags |= (ptr->flags & FMODE_READWRITE) * (STRIO_READABLE / FMODE_READABLE);
STRIO_READABLE    387 ext/stringio/stringio.c     RBASIC(self)->flags &= ~STRIO_READABLE;