Store default parameter values of internal functions in arg info

	3709e74b5e495e210ada8039ed81fafa9cbadcdb
Fix ZPP order in ext/zip
	78dda268eb2887709bdcbb7697785e80e231d58f
Fix UNKNOWN default values in ext/zip
	daa5b26456820a2414ad2fe0c264df44b43d13ff
Promote warning to exception in ZipArchive::extractTo()
	bce8c8fb272c6f0a84a1aa87d6dd0e7d6e28b6b3

Author: remicollet