Fix crash due to sorting with non-transitive order #277
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If given a certain difficult UNSAT instance as input, splr reliably crashes with "user-provided comparison function does not correctly implement a total order" after 20 minutes because comparing floats with epsilon tolerance is not transitive.
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If given a certain difficult UNSAT instance as input, splr reliably crashes with "user-provided comparison function does not correctly implement a total order" after 20 minutes because comparing floats with epsilon tolerance is not transitive. To see this, consider the relation$\approx$ defined as $x \approx y \iff |x-y| \le 1$ . Then $2 \approx 1$ and $1 \approx 0$ but not $2 \approx 0$ .