diff --git a/docs/decisions.md b/docs/decisions.md
index df1f440..a08b072 100644
--- a/docs/decisions.md
+++ b/docs/decisions.md
@@ -960,8 +960,8 @@ https://issues.chromium.org/issues/521080746 unfixed can run the library.
 
 The library reads JSON text with `parseJsonText`, never `JSON.parse`: from V8 13.6, `JSON.parse`
 can read an escaped key as another key it read before, and the round-trip then refuses its own
-output. A test fails on `JSON.parse(` in a shipped file. The tests' own oracles keep `JSON.parse`,
-since a misread there fails the gate and never hides a bug.
+output. A test reads escaped keys back through each reader after priming V8's misread. The tests'
+own oracles keep `JSON.parse`, since a misread there fails the gate and never hides a bug.
 
 ## An ADF document is read once into a plain copy
 
diff --git a/src/result.test.ts b/src/result.test.ts
index 02947ad..6bf3964 100644
--- a/src/result.test.ts
+++ b/src/result.test.ts
@@ -14,7 +14,7 @@ import { withinEngineLimits } from './length-bound.ts'
 const em: AdfMark = { type: 'em' }
 const duplicateMarks: AdfDocument = { content: [{ content: [{ marks: [em, em], text: 'x', type: 'text' }], type: 'paragraph' }], type: 'doc', version: 1 }
 
-// One refusal per code. The Record type fails the build where a code has no entry, or an entry names no code.
+// The Record type fails the typecheck where a code has no entry, or an entry names no code.
 const causes: Record<ConvertErrorCode, () => Result<unknown>> = {
   'engine-limit': () =>
     withinEngineLimits(() => {
diff --git a/todo.md b/todo.md
index 9d8ccf1..a3dcf9b 100644
--- a/todo.md
+++ b/todo.md
@@ -153,9 +153,9 @@ Technical principle: DRY. Found by the principles audit of the release review of
 
 ### 81. Fail the gate unless the README's error tables list exactly the codes `ConvertErrorCode` holds.
 
-`src/result.test.ts` holds one refusal per code in a `Record<ConvertErrorCode, …>`, so a code added
-or removed leaves the README's tables a false contract under a green gate. Assert that the tables
-list exactly the codes of that record's keys. Found by the technical-principles audit of item 78,
+Nothing checks the README's tables against the codes: `src/result.test.ts` holds a refusal per code,
+but a code added or removed leaves the tables a false contract under a green gate. Assert that the
+tables list exactly the codes `causes` holds. Found by the technical-principles audit of item 78,
 2026-10-05.
 
 ### 147. Ship `adfToPlainText`, writing a document's content with no markup, under a README goal for plain text.