Answer the stability nits: the guard proves the value, not just the row

src/markdown/emit/line-escaping.ts

@@ -231,7 +231,6 @@ function claimsCharacter(
   return false
 }
 
-// The last `]` link text could close on, so a `[` ahead of it opens one and a `[` past it cannot.
 // A `]` the emitter spelled sits inside a construct that binds before link text does.
 function lastLinkClose(scan: string, escapings: readonly (InlineEscaping | undefined)[]): number {
   for (let cursor = scan.length - 1; cursor >= 0; cursor -= 1) {

src/markdown/entity-references.test.ts

@@ -1,8 +1,8 @@
 import assert from 'node:assert/strict'
-import test from 'node:test'
-import { dirname, join } from 'node:path'
-import { fileURLToPath } from 'node:url'
 import { readFileSync } from 'node:fs'
+import { dirname, join } from 'node:path'
+import test from 'node:test'
+import { fileURLToPath } from 'node:url'
 
 import { readEntityReference } from './entity-references.ts'
 
@@ -16,6 +16,6 @@ test('every packed reference parts into one name and one value the table decodes
   assert.equal(references.length, 2125)
   for (const reference of references) {
     assert.match(reference, /^[A-Za-z][A-Za-z0-9]*~[^ ~]+$/)
-    assert.ok(readEntityReference(`&${reference.slice(0, reference.indexOf('~'))};`, 0) !== undefined)
+    assert.ok((readEntityReference(`&${reference.slice(0, reference.indexOf('~'))};`, 0)?.text ?? '') !== '')
   }
 })