Dear all,
I went into the following bug: it is possible to modify an entry of
vector whose parent is a submodule of R^n.
sage: V = VectorSpace(QQ, 3)
sage: M = V.subspace([(1,0,0,),(0,1,0)])
sage: v = M()
sage: v
(0, 0, 0)
sage: v[2] = 2 # bug
sage: v
(0, 0, 2)
sage: v.parent() is M
True
I opened https://trac.sagemath.org/ticket/22075 but I am not sure about
the solution. I see at least 2
1) forbid __setitem__
2) check when a modification is done that the vector still belongs to
the given submodule (possibly together with a __enter__/__exit__ hook)
Vincent
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