interface{ []byte | string }              // bytestring
interface{ ~[]byte | myString }           // bytestring
</pre>

<p>
Note that <code>bytestring</code> is not a real type; it cannot be used to declare
variables or compose other types. It exists solely to describe the behavior of some
operations that read from a sequence of bytes, which may be a byte slice or a string.
</p>

<h3 id="Type_identity">Type identity</h3>

<p>

* ✏ Fix minor typos in `docs/en/docs/async.md`. PR [#5125](https://github.com/tiangolo/fastapi/pull/5125) by [@Ksenofanex](https://github.com/Ksenofanex).
* 📝 Add external link to docs: "Fastapi, Docker(Docker compose) and Postgres". PR [#5033](https://github.com/tiangolo/fastapi/pull/5033) by [@krishnardt](https://github.com/krishnardt).

### API Machinery

Extensibility. SIG API Machinery added a new class of admission control webhooks (mutating), and brought the admission control webhooks to beta.

### Apps