R. David Murray added the comment:

It is not wrong.  It does not say that keys are limited to immutables, only 
that immutables can be keys.  Perhaps the sentence about a tuple pointing to a 
mutable could be tightened up, though, by saying that if a tuple points to 
something that can not itself be a dictionary key, then that tuple can not be a 
dictionary key.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29089>
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