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Wed Aug 4 17:53:49 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-August/102829.html

> -----Original Message-----
> From: "Martin v. Löwis" [mailto:martin at v.loewis.de]
> Sent: 3. ágúst 2010 20:48
> To: Kristján Valur Jónsson
> Cc: Python-Dev
> Subject: Re: [Python-Dev] pickle output not unique
> 
> > I just wanted to point this out.  We'll attempt some local
> workarounds
> > here, but it should otherwise be simple to modify pickling to
> optionally
> > turn off this optimization and always generate the same output
> > irrespective of the internal reference counts of the objects.
> 
> I think there are many other instances where values that compare equal
> pickle differently in Python. By relying on this property for hashing,
> you are really operating on thin ice.

Well, it is not _that_ dangerous.  It just causes cache misses when they wouldn't be expected.
But since this has been brought up and dismissed in issue 8738, I won't pursue this further.

K

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[Python-Dev] pickle output not unique