Version 0.2:
	The frozen info starts with 'FrT;'. Warning if not - nonfatal.
	Results of freezeEmpty are cached, explanation about caching
FreezeEmpty added.
	At last, all the tests are OK.
	Little bit more compact backreferences.
Version 0.2:
	New tests added and work.
	"Repeated" handled much cleaner now (basing on $secondpass).
	Packages are stored in a more compact form.
	Numbers are stored in a more compact form.
Version 0.4:
	Can handle overloaded objects.