"Optimize" psi2 for fast cofactor multiplication. #37
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x.frobenius().frobenius() computes x^(q^2) = x by Eulero-Fermat. So, just stay with x.
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I'm making a little pull request just to notify you, in case you wanted to align the code with the one in the RFC, and have a
psi2with less moving parts.It's just that when we apply Frobenius twice in this quadratic extension, we're basically applying the identity, so we can skip computing Frobenius altogether.