instance method Pathname#binwrite

(String, ?Integer offset, ?mode: Integer | String, ?flags: Integer, ?external_encoding: encoding, ?internal_encoding: encoding, ?encoding: encoding, ?textmode: boolish, ?binmode: boolish, ?autoclose: boolish, ?invalid: :replace ?, ?undef: :replace ?, ?replace: String, ?fallback: Hash[String, String] | Proc | Method, ?xml: :text | :attr, ?universal_newline: true, ?cr_newline: true, ?crlf_newline: true) → Integer