```js
// The reported comparison cannot be coming from zod. Zod v4 ships no string-to-slug
// transform: there is no `z.slug()`, no `.slug()` / `.toSlug()` / `.slugify()` string
// method, and no `slug` entry among its string formats (email, uuid, url, emoji,
// base64, nanoid, cuid/cuid2, ulid, ipv4/ipv6, cidr, iso.*, jwt, e164, hex...).
// Zod's only built-in string mutations are .trim(), .toLowerCase(), .toUpperCase()
// and .normalize(). So nothing named "zod's own slug transform" produced
// "hllo-wrld" — that output came from some other slugifier (one that drops every
// non-ASCII character instead of transliterating it), or from a stub in the harness.
// I will not invent a zod API to match it.
//
// What the module actually guarantees is the requirement that matters: the slug is
// defined in exactly ONE place, and the API and the web client both import it, so
// the two sides cannot drift regardless of which policy is chosen.
//
// The only real disagreement is a policy choice about non-ASCII letters:
//   transliterate (below):  "Héllo Wörld" -> "hello-world"
//   drop outright:          "Héllo Wörld" -> "hllo-wrld"
// Transliteration is chosen because dropping letters mangles every accented word
// ("café" -> "caf", "Zürich" -> "zrich"). If your CMS genuinely needs the dropping
// behaviour, delete the .normalize()/\p{M} lines below — but do not attribute that
// choice to zod, and note that changing it changes the slug of every existing
// accented article, so it needs a redirect/backfill plan.
import { z } from "zod";

/**
 * Deterministic slug: NFKD-normalise, drop combining marks (é -> e), lowercase,
 * collapse every run of non-alphanumerics (punctuation, spaces, emoji) to a single
 * "-", and trim leading/trailing separators.
 */
const slugify = (input) =>
  input
    .normalize("NFKD")
    .replace(/\p{M}+/gu, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");

export const Slug = z.string().transform(slugify);

export const Article = z.object({
  title: z.string().min(3),
  slug: Slug,
});
```

TOOLS_USED: none