Issue with symmetry of cone isomorphisms

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When determining if two cones are isomorphic the answer appears to depend on the order.

a = Cone(Matrix([(1,-5,8),(-1,4,8),(3,2,19)])  
b = Cone(Matrix([(1,0,0),(0,1,0),(1,1,3)]))  
a.is_isomorphic(b), b.is_isomorphic(a)

(False, True)

Is this intended?