Guido van Rossum <gu...@python.org> added the comment:

Thanks for the long post! Clearly there is more here than the eye can easily 
see.

Nevertheless, I feel that, *in this case*, it's not likely that such a 
re-implementation will ever happen, so I think it is okay to constrain the 
future so we can guarantee (the ordering aspect of) the current behavior. The 
current behavior also *feels* natural, regardless of the validity of the OP's 
use case.

The edge case of assignment to __bases__ is a good one to call out (in the docs 
and in the test) but I don't think the current behavior there is sufficiently 
dicey to change it or to exclude it from the guarantee.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34805>
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