[ruby/date] Fix incorrect argc2 decrement in datetime_s_iso8601 function
Replace the decrement (argc2--) with an increment (argc2++) for the correct number of arguments when opt is provided.
https://github.com/ruby/date/commit/b6974b00d8
[ruby/date] Fix incorrect argc2 decrement in datetime_s_iso8601 function
Replace the decrement (argc2--) with an increment (argc2++) for
the correct number of arguments when opt is provided.
https://github.com/ruby/date/commit/b6974b00d8