sage.structure.mutability was added very recently, so there isn't anything 
yet that uses it afaik. Feel free to be the first ;-)

On Monday, October 7, 2013 3:57:40 PM UTC+1, Daniel Krenn wrote:
>
>   mutability.pyx:45  self._is_immutable = 1 
>   sequence.py:       self._is_immutable = True 
>

These are equivalent for a cdef public bint attribute.
 

> Anyhow, a lot of classes implement mutability by themselves, see [3]. 
>

Technical limitation, you can't use multiple inheritance if there are cdef 
attributes in Cython.  

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