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One edge differs from Prettier: after an atom whose last line is already past the width, mdtidy breaks before the next word and Prettier doesn't.","## Wrapping","- `list/huge-first-number.md`: renumbering past 9 digits (`999999999.` becomes `1000000000.`, which isn't a list marker).","- `list/followed-by-indented-things.md`: a list item with a wide marker, followed by indented code.","- `ignore/top-level-range.md`: an ignore range at the top level doesn't settle after one pass.","- `blockquote/prose-wrap-always/encoded-newline.md`: an encoded newline (` `) in a quote.","Four of Prettier's fixtures (corpus D) still fail the semantics oracle, with the default options too:","## Known bugs that change meaning","- An emphasis mark right after a `*` is `_`. Prettier writes `*`, which merges into `***` and nests the other way.","- Link targets and definitions stay as written where Prettier's form would read differently: unbalanced parentheses, `<`, `>`, a backslash, text that decodes as an entity, or a title with `(` in parentheses.",38,[82,83,84,85,86,87,88,89],{"_66":67,"_68":69},{"_66":67,"_68":94},{"_66":67,"_68":93},{"_66":36,"_68":92},{"_66":34,"_68":91},{"_66":67,"_68":69},{"_66":67,"_68":90},{"_66":67,"_68":69},"## Known gaps against Prettier","- **Prettier**: the target is Prettier 3.9.10. `mise run oracle:prettier -- ... [--show ]` formats one copy with Prettier (cached in `target/oracle`), one with mdtidy, counts identical files, and sorts the differences by kind. It hands mdtidy every file by name, because the CLI skips hidden folders on purpose. Last result: A 870/872, B 2,140/2,142, C 3,416/3,466, D 278/310. The semantics oracle passes on all four. `bun fmt` is close (8 misses, all inside code blocks) but it is not the reference.","- **Prettier**: the target is Prettier 3.9.10. `mise run oracle:prettier -- ... [--show ]` formats one copy with Prettier (cached in `target/oracle`), one with mdtidy, counts identical files, and sorts the differences by kind. It hands mdtidy every file by name, because the CLI skips hidden folders on purpose. Last result: A 870/872, B 2,140/2,142, C 3,415/3,466, D 273/310. The semantics oracle passes on A, B, and C; D fails only on the bugs listed below. `bun fmt` is close (8 misses, all inside code blocks) but it is not the reference.","- **Speed**: `mise run bench:ab -- [--rev ] ...` builds the working tree and `` (HEAD by default, in a temporary worktree), times both checking the folders in both orders, and compares medians: means swing with machine load. Each fix on 2026-10-30 and 2026-11-01 was within noise; together they cost about 2–3% (about 38 to 39 ms on A + B).","- **Semantics**: `MDTIDY_CORPUS=[:...] mise run oracle:semantics`. Every output re-parses to the same events (adjacent text merged, soft breaks as spaces, whitespace collapsed) and settles after one pass. It runs the Prettier preset, the Preserve preset, `wrap: always` at width 40, and `wrap: never`. It caught every real bug so far: trust it over reading diffs. When a file fails, `mise run oracle:shrink -- [mdtidy options...]` removes lines while it still fails and prints the few that are left. The events it compares come from `tests/support/events.rs`, shared by the test and the `events` example.","oid","24a0f5b","mode","100644","a2773a8","parents",[20],"author",{"_114":115,"_116":117,"_122":123},"committer",{"_114":115,"_116":117,"_122":123},"message","docs: update handoff\n\nThe four fixture bugs are fixed, so the semantics oracle passes on\nevery corpus. 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