new callback checkers

git-svn-id: svn://fountainhead.talkpoint.com/nori/trunk@12713 940247f8-a3eb-dc11-81c7-0019d144f6e4
make container/sequence/mapping type tuples more logical

git-svn-id: svn://fountainhead.talkpoint.com/nori/trunk@12724 940247f8-a3eb-dc11-81c7-0019d144f6e4