Require Perl 5.006 to get pack 'q' for quads.  C'mon, it's been over a decade now.
Support packing and unpacking of full range of signed and unsigned integer values,
  though broker differences may make their use problematic.
Fix signedness of integer packing and unpacking (signed were treated as unsigned).
Introduce Net::AMQP::Value::* classes to control packing of table values.
  (And understand boolean values from the "boolean" class likewise.)