On Mon, Feb 11, 2013 at 11:27:03PM +0000, Simon King wrote:
> In contrast to all other category containment tests,
> Fields().__contains__(P) does not only rely on the declared category of P, but
> it would call P.is_field(),
Just a quick note: the fact that P in Fields() triggers P.is_field()
is only there because I did not want to handle yet another backward
compatibility issue when I refactored the precategory code four years
ago. But I have thought we should get rid of it at some point.
Due to the Sage Days here, it might take a couple days before I answer
the other points.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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