[issue35900] Add pickler hook for the user to customize the serialization of user defined functions and types.

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

FYI, I've removed the duplicate message :-)  Also adding Serhiy as cc.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35900>
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