Hi
When I do "0 + myElement" the coercion framework seems to map this
to a common parent of 0 and myElement (by checking the parent of 0 and
myElement).
ZZ does not coerce into myElement.parent() so I end up in a much
larger space than myElement.parent(). However I would prefer if adding
zero didn't change the parent space. One reason is for instance that
sum(...) no longer works properly because it always prepends "0+".
Eg: from sage.modular.modform_hecketriangle.all import *
myElement = ModularForms().E4()
myElement.parent() != sum([myElement]).parent()
Clearly "0" is a special case (the zero subspace does coerce into any of
the spaces).
How should I fix this?
Best
Jonas
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