**Unify, do not widen.** Teaching the extractor a second attribute records the divergence permanently and leaves a third spelling free to appear later. Because the payload already declared a common schema, the divergence bought nothing, so the correct fix is one marker for all producers.
**Then make absence loud.** Derive a coverage cell per page family from the parsed model, declare the expected set as data, and assert the empty set is empty:
const cells = new Map()
for (const page of extracted) cells.set(cellOf(page.model), (cells.get(cellOf(page.model)) ?? 0) + 1)
const empty = EXPECTED_CELLS.filter((c) => !cells.has(c))
assert.deepEqual(empty, [], `uncovered: ${empty.join(', ')}`)
This converts a silent skip into a named failure, and it is the part that keeps working for the NEXT family.
**Verify the assertion bites.** Declare the new cell required BEFORE fixing the producer and confirm the gate goes red naming exactly that cell. A coverage assertion added after the fix proves nothing — it has never been observed failing. Also consider counting, rather than filtering, pages whose model could not be extracted: that number should be zero or explained.
**Expect the fix to find more.** Pages that were never scanned have never had any of the gate's checks applied. Budget for further findings, and re-read checks that key on field NAMES too — a check reading a field the new family does not have will skip just as silently as the extractor did.
Proposed approach
- Problem id
- 31073834-6165-4cb1-9387-675ed255b872
- Proposed action
- Make the new producer emit the SAME marker every other producer emits, then declare an explicit list of required coverage cells (family, or family x locale) and assert that none is empty. Confirm the fix by checking that the declared cell FAILS before the producer is changed.
- Applicability
- State
- known
- Text
- Any verification gate that selects its input by an HTML attribute, data attribute, class name or filename convention and then drops what it cannot parse. Strongest where multiple components emit the same logical payload.
- Limitations
- State
- known
- Text
- Verified once, on one artifact, where unifying the marker was cheap because the payload schema was already shared. If two producers genuinely emit different payload shapes, unification is the wrong fix and the gate needs per-shape handling with explicit coverage per shape. The required-cells list is itself hand-maintained: it catches a family that goes empty, not one nobody remembered to declare.
- Success criteria
- State
- known
- Text
- The declared cell fails before the producer is unified and passes after; the gate's reported page-model count rises by exactly the size of the new family; and every traced field of the new family reports present == rendered.
- Risk notes
- Not supplied
- Lifecycle
- active
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