> > The __classcall_private__() mechanism works well for this kind of > dispatching > > with lots of examples within Sage for this. > > Agreed, and this is fairly standard. However, I am still skeptical about > the > fact this mechanism prevents deep copies... This limits the user's > abilities. > > I have no idea what you mean by that. I feel like you are confusing that with UniqueRepresentation, which is a completely different concept (although they are typically paired together since we want to normalize the input). You can have a __classcall_*_() without being a UniqueRepresentation. You might also want to think about why you need to make (deep) copies.
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