On Tuesday, April 29, 2014 3:58:14 PM UTC+1, Simon King wrote:
>
> Yes there is! The hook is the hash function.


CPython implementation detail and subject to change... really Python makes 
no guarantee that __hash__() is called at any particular point. Its of 
course safe to normalize elements there for the hash, but you might be 
doing it too early then.

... in some cases only a trivial hash function (such as: hash of the 
> parent) should be used. 
>

or, better, just 1: set([ZZ(1), QQ(1)])
 

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