Message 17907 - Python tracker

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Here is the doc patch (attached).

A clean solution to this problem would involve delaying GC
registration, which I think would imply changes in the C
API. It is probably not worth it. I don't think it would be
a problem for the GC not to be able to browse through
objects still under constructions because such objects are
never part of a dead cycle anyway, and probably not part of
a cycle at all until later mutated.