Why it matters: a graph with VCF-capable reference/sample metadata and no selected flubbles must produce a valid header-only VCF, not fail and not invent records. External-tool note: this is a ...
#link("https://github.com/pangenome/povu/blob/main/PovuLean/Algorithms/Flubble/Correctness.lean#L235")[#raw("PovuLean.Algorithms.Flubble.flubble_count_le_numEdges ...