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Generalized crt: compatibility divisibility · case 02
The exact generalized crt result violates the stated contract at compatibility divisibility.
Case contract
Input [a,m,b,n], positive moduli; return least nonnegative common residue and lcm modulus or None.
Why this case matters
Exact discrete arithmetic with observable algorithmic state; no floating point approximation is used.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| explicit oracle 0 | null | [0, 1] | Failed |
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