> I'd have to check carefully. There's likely to be some performance loss 
> even when all obvious bottlenecks are accounted for, because for our 
> special classes BinaryMatrix, TernaryMatrix, QuaternaryMatrix we use inline 
> get() and set() methods that bypass the Sage finite field elements. We want 
> this code to push the limits of matroid computation, so we'd hate to incur 
> even a 10% speed loss.
>

Oh, we also use bitpacking for GF(3) and GF(4), which in Sage is done only 
for binary matrices currently, if I'm not mistaken.

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