PSchaafsma added the comment:
There are indeed many easy workarounds, and we definitely don't want to
introduce any incompatibilities.
I guess the best thing to do is just update the documentation, right?
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Python tracker
New submission from PSchaafsma:
The documentation of persistent_id prescribes that returning None will cause
default pickling behavior. This makes sense.
However, in the Pickler.save function in pickle.py, the return value of
persistent_id checked as boolean, causing also return values like 0
