Jason R. Coombs <jar...@jaraco.com> added the comment:

Martin makes a good point, but I see it somewhat differently.

virtualenv and its users have always accepted the risk of running an old 
interpreter against a different standard library (of the same minor version). 
So the risk of not receiving the security patch in the interpreter is 
well-known.

The risk they have not (previously) accepted (afaik) is that an interpreter of 
one patch version will not be compatible with the standard library of another 
patch version.

I could very well be wrong about the latter.

While I think we all agree that this is not a bug in Python, per se, the more 
practical matter is that this issue is likely to cause substantial trouble in 
practice, perhaps an unprecedented experience. I would hate for all the hard 
work that was put into this security fix to be tainted by cries of trouble 
caused by the fix (however unjustified). Providing backward-compatibility for 
virtualenv would avoid that risk and would not expose the users of virtualenv 
to any more risk than they've previously accepted.

For that reason, I'm +1 on the compatibility patch(es).

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