[sage-support] Default output form for AlgebraicNumber

[Jori Mäntysalo]

Matrix(QQ, [[1,2],[3,4]]).eigenvalues() --> [-0.3722813232690144?, 
5.372281323269015?]

Not good for teaching (and I just got a complain for that). Of course I 
can do map(lambda x: x.radical_expression(), M.eigenvalues()) or something 
similar. Or begin with Matrix(SR, ...).

But is there a default setting to change output type of AlgebraicNumber?

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Jori Mäntysalo