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Rational mediant walk: right bound replacement · case 05
The exact rational mediant walk result violates the stated contract at right bound replacement.
Case contract
Input path over L/R; return Stern-Brocot interval bounds and its mediant.
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 | [[0, 1], [1, 3], [1, 4]] | [[1, 3], [1, 2], [2, 5]] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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