Hello everybody,

Because of #19737 [1] (which was just opened) I learned the existence
of SetPartition.to_permutation.

A SetPartition object represents, as expected, a partition of a given
set. For FindSt---- some reason, there is a function turning it into a
permutation object [2], added in #14140 [3].

I do not see how this function can be defined mathematically and so I
write here to ask what you think we should do about it. Remove it?
Rename it? Move it to some other class?

Thanks,

Nathann

[1] http://trac.sagemath.org/ticket/19737

[2] Which raises an exception when one defines a partition of a set
which is not a set of integers:

    sage: SetPartition([{'a','b','c'}]).to_permutation()
    ...
    TypeError: cannot concatenate 'str' and 'int' objects

[3] http://trac.sagemath.org/ticket/14140

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