End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
IO::generic_readable#readbyte
strio.readbyte → fixnum
ext/stringio/stringio.c
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static VALUE
strio_readbyte(VALUE self)
{
VALUE c = rb_funcallv(self, rb_intern("getbyte"), 0, 0);
if (NIL_P(c)) rb_eof_error();
return c;
}
See IO#readbyte.