I'd be glad to help with that, Christian.
I've added a doc string to the DeferExpr module. Do you want me to write more docs is it enough to be added to the ZPT guide?
Also I need a little help for the unit tests. How can I emulate tal:content or similar inside an expression test?
Except of some missing unit tests the branch is ready to merge. I would like to get the changes into Zope 2.7.6 so we could use them for Plone 2.1.0.
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