Computing `rank(::Matrix{Num}` yields `MethodError: no matching eps(::Num)`

[MarkusLohmayer]

I want to compute the rank of a symbolic matrix:

A = Num[0 -1 1; 1 1 1; 1 -1 0]
rank(A)

unfortunately this yields MethodError: no matching eps(::Num)

Looking at the code it seems like this is more of a feature request. If I get a good hint, maybe I can work on a PR. Thanks a lot!

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