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"callback interface LifecycleCallbacks" Why can't this be a normal callback? There's no reason for a callback interface as far as I can tell.
There will be more methods on this interface, like "attributeChanged", etc. See http://www.w3.org/TR/components-intro/#appendix-a-interfaces for a glimps of the (somewhat obsolete and handwavy) future.
Does not seem like FIXED to me ;-) I hope this will go away entirely though as per emails on the document.createElement() subject.