Demur Rumed added the comment:

mapaca2 heavy handily deals with the must-work-with-all-mappings by converting 
any non dict mappings on the stack with dicts when with_call is true

I'm not sure if it'd be better to seek a less opcode centric fix-- ie introduce 
a method to dictobject which returns None if no collision occurs otherwise it 
returns the first key which collides and stops updating at that point. 
PyDict_DistinctUpdate

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Added file: http://bugs.python.org/file43498/mapaca2.patch

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<http://bugs.python.org/issue27358>
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