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

One other thought:  We should add a note to the docs for all of the 
serialization formats saying that we specifically disclaim that they will 
always generate exactly the same output byte-for-byte.  When Serhiy made some 
small optimizations to the encoding of pickles, it would have broken any test 
that checked byte-level equality rather than semantic level equality (checked 
by making sure the pickle/unpickle steps would round-trip without loss of 
information).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34160>
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