Hi,

IIRC we had some problem with SchemeMorphism recently while making (or 
while Simon wa making I must say) the coercion system more cache friendly.
See #14711 and especially:
* http://trac.sagemath.org/ticket/14711#comment:85
* http://trac.sagemath.org/ticket/14711#comment:93
* and whatever is inbetween and afterward.

Best,
JP

On Friday, November 8, 2013 4:03:16 AM UTC+1, vdelecroix wrote:
>
> Hi, 
>
> I was working with #15378 and I wondered why SchemeMorphism inherits 
> from Element and not from Morphism as they should. I just discovered 
> that this is because points on a scheme are special kind of 
> SchemeMorphism. So in order to make it a group law for example, they 
> need to be Element... 
>
> I am completely stuck here. For the moment, my hack is to make 
> SchemeMorphism_polynomial not inherit from SchemeMorphism. This is 
> just crazy! 
>
> Please help 
> Vincent 
>

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