STRIO_READWRITE   369 ext/stringio/stringio.c     RBASIC(self)->flags &= ~STRIO_READWRITE;
STRIO_READWRITE   481 ext/stringio/stringio.c     RBASIC(copy)->flags &= ~STRIO_READWRITE;
STRIO_READWRITE   482 ext/stringio/stringio.c     RBASIC(copy)->flags |= RBASIC(orig)->flags & STRIO_READWRITE;