[issue3458] dict.update() optimisation gives unexpected/invalid results when passed a subclass of DictType

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Will look back in my notes.  I believe this was previously discussed 
and rejected.

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assignee:  -> rhettinger
nosy: +rhettinger

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<http://bugs.python.org/issue3458>
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