[issue21986] Idle: disable pickleability of user code objects

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It would be good to add a test of rpc.dumps().

Current code copies copyreg.dispatch_table at the moment of rpc import. But it 
can be changed later and these change will not affect private copy. For example 
the re module adds pickleability of compiled regex patterns. I think the use 
of ChainMap is more safe solution.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21986>
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