Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> how that's acceptable?

For docutils, we'll most likely propose some variant of Stéphane Wirtel's 
script to test semantic equivalence for docutils.  For other cases, Serhiy is 
working on a C14N canonicalization tool which is specifically designed for the 
task of creating reproducible output, in a cross-language standards compliant 
way.

As Stefan Behnel clearly articulated, there are multiple reasons why Python 
should not guarantee byte-for-byte serialization across point releases.  That 
said, we'll likely make the guarantee across micro-releases.  That will make it 
possible a third mitigation strategy of generating new baseline files for a new 
point releases and adding a version check to decide which baseline to test 
against.

FWIW, we had a similar discussion regarding hash randomization.  While there 
are a number of significant differences, the outcome is relevantL  User tests 
that depended on non-guaranteed implementation details had to be fixed.

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<https://bugs.python.org/issue34160>
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