Answer prose round 1: 0 🔴, 4 🟡; cut the decisions entry to what was kept, split the changelog bullet, and drop the item 120 tagline's clause

src/markdown/inline-tokens.ts

@@ -1,6 +1,6 @@
 import type { ClaimedPrefix } from './directive-syntax.ts'
-import type { CodeSpanCloser } from './commonmark/backtick-runs.ts'
 import type { Claims } from './portable/conventions.ts'
+import type { CodeSpanCloser } from './commonmark/backtick-runs.ts'
 import { backslashEscape, inlineHtmlConstruct, readBracketedAutolink, readEmailAutolink } from './commonmark/grammar.ts'
 import { backtickCloser, backtickRun } from './commonmark/backtick-runs.ts'
 import { claimDirectivePrefix } from './directive-syntax.ts'

src/markdown/parse/blocks.ts

@@ -606,7 +606,7 @@ function sourceLine(markdown: string, line: number, start: number, end: number):
   return { position: { line, offset: start }, text: replaceNullCharacters(markdown.slice(start, end)) }
 }
 
-// Counting stops at `upTo` columns, so a test against a width costs the width, not the line's whole indentation.
+// `upTo` caps the cost: checking a line against an item's width reads at most that width.
 function leadingColumns(line: Line, upTo = Infinity): number {
   let columns = 0
   for (const character of line.text) {