[issue12422] When deepcopying, don't store immutable objects in the memo dict

[Alex Gaynor]

Alex Gaynor <alex.gaynor at gmail.com> added the comment:

A slightly cleverer version (or less clever, depending on how you approach the issue) that also works with tuples of immutable content.

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Added file: http://bugs.python.org/file22499/d.diff

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