FA-12578 / Genomic coordinate mapping / Member archive
Lifted coordinates discard ambiguous chain mappings · case 03
Lifted coordinates discard ambiguous chain mappings.
Case contract
Synthetic chain hits are [contig,base] mappings for one source base; return the unique destination pair or None.
Why this case matters
An abstract offline coordinate model isolates this software mapping defect; it does not model biological interpretation.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| conflicting positions | ["a", 3] | null | Failed |
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