On 2015-02-22 15:24, Simon King wrote:
Seriously? I didn't know that Sage's coercion model has such special cases. OK, it makes it possible to get a typical usecase with least effort. But my impression is that ultimately such special cases cause a lot more confusion than a clear model in the spirit of "arithmetics across parents relies on coercion morphisms, which are canonical morphisms in suitable categories, and the composition of coercion morphisms is a coercion morphism".
On the other, this special case is consistent with the idea of the "univeral 0 object" proposed by John Cremona.
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