Serhiy Storchaka added the comment:

Nice example.

The only fix I see is caching the hash in a tuple. This can even help in more 
cases, when tuples are used as dict keys. But this affect too much code, and 
can even break a code that mutates a tuple with refcount 1.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30416>
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