End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Zlib::GzipWriter#<<

<<(p1)

#define rb_gzwriter_addstr  rb_io_addstr

Same as IO.

See also .open #comment= .new #flush also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0