# File lib/msgpack/core_ext.rb, line 3
    def to_msgpack(packer_or_io = nil)
      if packer_or_io
        if packer_or_io.is_a?(MessagePack::Packer)
          to_msgpack_with_packer packer_or_io
        else
          MessagePack.pack(self, packer_or_io)
        end
      else
        MessagePack.pack(self)
      end
    end