Hello all,
In ticket #20767, I have made two important changes to the coercion
model for arithmetic:
1. Move all coercion logic from RingElement, ModuleElement and the like
to Element.
2. Change the implementation of double-underscore methods like __add__
to return NotImplemented if one argument is not a Sage Element and
coercion fails.
More details at the ticket: https://trac.sagemath.org/ticket/20767
For everyone who has been struggling with arithmetic using the coercion
model, it might be worth having a look at that ticket and see if it
fixes the problem. And obviously, I welcome reviewers :-)
Jeroen.
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