Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
IO::generic_readable#readline
readline(sep = $/, chomp: false) → string
readline(limit, chomp: false) → string
readline(sep, limit, chomp: false) → string
ext/stringio/stringio.c
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static VALUE
strio_readline(int argc, VALUE *argv, VALUE self)
{
VALUE line = rb_funcallv_kw(self, rb_intern("gets"), argc, argv, RB_PASS_CALLED_KEYWORDS);
if (NIL_P(line)) rb_eof_error();
return line;
}