…#16403)

`normalize_param_definition` checks for a function before checking for
`~standard`, but standard schemas can themselves be callable. ArkType's
`type()` returns one, so it gets wrapped as a plain function matcher and
its own validation never runs. The wrapper then treats whatever the call
returns as the parsed value, and ArkType returns an `ArkErrors` instance
rather than throwing:

```js
const matcher = normalize_param_definition(type('string.numeric'));
matcher['~standard'].validate('not-a-number');
// { value: ArkErrors } so the route matches, with an ArkErrors instance as the param
```

Checking `~standard` first fixes this, verified against arktype 2.x
(invalid values now produce `issues`, so the route no longer matches).
It also matches `ParamEntry` in `public.d.ts`, which has resolved
callable schemas to the schema branch since #16189. Same discriminator
fix as #16402.

The new test fails on `version-3`.

---

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# Releases
## @sveltejs/[email protected]

### Major Changes

- breaking: `config` exported from a universal route file takes
precedence over a server one
([#16400](#16400))

- breaking: consistent special filename patterns
([#16382](#16382))

### Minor Changes

- feat: support sourcemaps in production
([#16412](#16412))

- feat: support function validators for environment variables
([#16402](#16402))

- feat: better error logging
([#16374](#16374))

### Patch Changes

- fix: don't treat callable standard schemas as function param matchers
([#16403](#16403))

- fix: reject malformed streamed data encoding
([#16423](#16423))

- fix: hide stack traces for internal errors like 404s
([#16411](#16411))

- perf: match only unpaired surrogates when escaping HTML
([#16407](#16407))

- fix: don't report empty environment variables as missing
([#16401](#16401))

- chore: clarify which hooks run during server route resolution
([#16397](#16397))
## @sveltejs/[email protected]

### Minor Changes

- feat: better error logging
([#16374](#16374))

### Patch Changes

- Updated dependencies
[[`5220191`](5220191),
[`8cb2f7d`](8cb2f7d),
[`b88c7a7`](b88c7a7),
[`a6ea113`](a6ea113),
[`6446f64`](6446f64),
[`58f1789`](58f1789),
[`09774a2`](09774a2),
[`c542fdd`](c542fdd),
[`aedaa27`](aedaa27),
[`428ee1a`](428ee1a),
[`fefb3ae`](fefb3ae)]:
  - @sveltejs/[email protected]

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