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The scale-free determinant test no longer builds a rescaled copy of the map. It forms each of the six determinant products as a mantissa product and an exponent sum and compares their sum with the largest of them, so a map such as diag(1e307, 1e-157, 1e-157), whose rescaled copy overflows, is still invertible and loads from a document. The rescaled copy is built only to invert a map whose determinant is not finite or is below the normal range.