Parse the data attached to the datagram through a newly created
ObjectDumper, and answer the resulting object. This method is
complementary to #object:address:port:.
getThrough: objectDumper
Parse the data attached to the datagram through the given
ObjectDumper without touching the stream to which it is
attached, and answer the resulting object. The state of
the ObjectDumper, though, is updated. This method is
complementary to #object:objectDumper:address:port:.