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_writable#<<

strio << obj → strio

ext/stringio/stringio.c View on GitHub ↗

#define strio_addstr rb_io_addstr

See also #print #printf also in 3.4 · 3.3 · 3.2 · 3.0