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* continue the decomposition until a pivot is exactly zero; don't try to compute the rank in the decomposition itself. * Instead, methods such as rank() use a new internal parameter called 'threshold' to determine which pivots are to be considered nonzero. * The threshold is by default determined by defaultThreshold() but the user can override that by calling useThreshold(value). * In solve/kernel/image, don't assume that the diagonal of U is sorted in decreasing order, because that's only approximately true. Additional work was needed to extract the right pivots.