Another thing that I hope we can eventually start supporting is some basic 
category theory, which I feel would justify having a number of categories 
at the top level. Nicolas and I have also discussed having things like 
Groups().free(foo) as hooks to create free objects (or any other special 
objects wrt the category). The extra level of indirection makes this 
slightly harder I feel.

However, I am a definite +1 for having a catalog of categories.

Best,
Travis

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