fdp plain/plain-ext parity dashboard

Differential survey of @knowvah/dot-engine fdp plain/plain-ext output vs the native dot -K fdp oracle (test/corpus/plain-walk.ts), semantic comparison per docs/conformance.md (±0.01 deterministic tolerance, ±0.5 for the iterative engines). Regenerate: npx tsx test/corpus/plain-walk.ts fdp && npx tsx test/corpus/parity-report.ts.

Summary

• Surveyed: 762
• pass: 750 (98.4%) · diverged (tracked): 0 · accepted (documented, won't-fix): 7
• errors (oracle/port/timeout, excluded from scoring): 5

Diverged (0)

(none)

Accepted (7) — documented, not chased

id	#diffs	firstDiff	reason
graphs-b34	5	[node] 7/label: port=montañas native=solid; [node] 7/style: port=solid native=box; [node] 7/shape: port=box native=black; [node] 7/color: port=black native=lightgrey; [node] 7/fillcolor: port=lightgrey native=	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.
graphs-b56	6	[node] Schluesseloel/label: port=Schluesselöl native=��; [node] Schluesseltraeger/label: port=Schlueßelträger native=��; [node] Torschluessel/label: port=Torschlüssel native=��; [node] Torwaechter/label: port=Torwächter native=��; [node] creation/label: port=<f0>genPräfix|<f1>legennStamm|<f2>heitnSuffix native=<f0>genPr�fix|<f1>legennStamm|<f2>heitnSuffix	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.
graphs-b60	5	[node] 0/label: port=XXXrôôôôôôôôôôôôôôleXXX native=solid; [node] 0/style: port=solid native=ellipse; [node] 0/shape: port=ellipse native=black; [node] 0/color: port=black native=lightgrey; [node] 0/fillcolor: port=lightgrey native=	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.
graphs-Latin1	5	[node] a/label: port=áâãäåæçèéêëìíîïðñòóôõöøùúûü native=solid; [node] a/style: port=solid native=ellipse; [node] a/shape: port=ellipse native=black; [node] a/color: port=black native=lightgrey; [node] a/fillcolor: port=lightgrey native=	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.
graphs-Symbol	6	[node] greek/label: port=αβγδεζηθικλμνξοπρςστυφχψωϒϖ native=solid; [node] greek/style: port=solid native=ellipse; [node] greek/shape: port=ellipse native=black; [node] greek/color: port=black native=lightgrey; [node] greek/fillcolor: port=lightgrey native=	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.
share-Latin1	5	[node] a/label: port=áâãäåæçèéêëìíîïðñòóôõöøùúûü native=solid; [node] a/style: port=solid native=ellipse; [node] a/shape: port=ellipse native=black; [node] a/color: port=black native=lightgrey; [node] a/fillcolor: port=lightgrey native=	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.
windows-Latin1	5	[node] a/label: port=áâãäåæçèéêëìíîïðñòóôõöøùúûü native=solid; [node] a/style: port=solid native=ellipse; [node] a/shape: port=ellipse native=black; [node] a/color: port=black native=lightgrey; [node] a/fillcolor: port=lightgrey native=	oracle bug (A4): canon() use-after-free — output.c:103-108 agstrfree()s the agstrdup-ed refstr before the caller prints it, and _agstrcanon returns that pointer whenever no quoting is needed. Labels whose text is not otherwise pooled (latin1/entity-converted, differs from the raw attr bytes) hit refcnt 0 and are freed; the intervening printdouble allocations reuse the block, so native prints garbage/empty. Port prints the correct converted text. Journal 2026-07-24.

Errors and timeouts (5)

id	message
1652	oracle exit null
2222	oracle exit null
2239	Warning: Warning: no hard-coded metrics for 'sans'. Falling back to 'Times' metrics
2620	Warning: Warning: no hard-coded metrics for 'Times-Bold'. Falling back to 'Times' metrics
2717	oracle exit null

Passing ids (750) are omitted for brevity — the full roster is in plain-parity-fdp.json.