Hi Volker,

On 2014-04-29, Volker Braun <[email protected]> wrote:
> Always putting things in canonical form will be slow (there is no hook for 
> "you are about to be put into a set")

Yes there is! The hook is the hash function. If you need a hash (i.e.,
if you put it into a set or dict) then you need a canonical form, or...

> and/or not possible (fp group 
> elements). 

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

Best regards,
Simon

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