FA-12563 / Genomic coordinate mapping / Member archive

Intronic coordinate ties choose the wrong transcript anchor · case 03

Intronic coordinate ties choose the wrong transcript anchor.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

For reference base p strictly inside the intron between exon-end base left and exon-start base right, return [anchor,signed distance]; upstream transcript boundary wins ties.

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 fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
plus near right	`[30, 7]`	`[38, -1]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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