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- for cases where a 3D tensor is being used to represent 2D content, the determinant is zero. Can use inv2D(excludeDirection) to compensate and invert as if it were only 2D. ENH: consistent definitions for magSqr of symmTensors, diagSqr() norm COMP: return scalar not component type for magSqr - had inconsistent definitions with SymmTensor returning the component type and Tensor returning scalar. Only evident with complex.