Ned Deily <n...@python.org> added the comment:

The potential change in behavior affecting existing code was one issue.  But 
the other was the fact that people writing tests to make use of the new 
behavior can't depend on that behavior being there for 3.7 or 3.6 without 
checking the patch level, for example, 3.6.7 vs 3.6.6.  That's one of the main 
reasons we generally do not backport behavior changes unless they are a clear 
bug; as I noted. this particular issue seems somewhere in between a bug and a 
feature.  Given how far along we are in the 3.6.x cycle, I think we definitely 
should not backport to 3.6.  Since 3.7 is near the beginning of its support 
cycle, I would not object if we did backport this for 3.7.1.  I'll leave it up 
to Berker.

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<https://bugs.python.org/issue32933>
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