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
If currently two unsigned values are compared via `a - b`, in the case b is actually bigger than a, the result will not be an negative number (as -1 is expected) but a huge positive number as the subtraction is an unsigned subtraction. Avoid over-/underflow affected operations; use comparisons. Modern compilers will generate sane code, like: xor eax, eax cmp rdi, rsi seta al sbb eax, 0 ret