flesh out the nummatrix2d subclass tests. This appears to cover all VTABLEs that use mapped types
flesh out the nummatrix2d subclass tests. This appears to cover all VTABLEs that use mapped types

fernandobrito/parrot-linear-algebra,Whiteknight/parrot-linear-algebra,fernandobrito/parrot-linear-algebra,fernandobrito/parrot-linear-algebra,fernandobrito/parrot-linear-algebra,Whiteknight/parrot-linear-algebra