## 0.50.0

* Add link to Release Notes from docs about pinning versions for deployment. PR [#1058](https://github.com/tiangolo/fastapi/pull/1058).
* Upgrade code to use the latest version of Starlette, including:
    * Several bug fixes.
    * Optional redirects of slashes, with or without ending in `/`.
    * Events for routers, `"startup"`, and `"shutdown"`.

</p>

<p>
The core type of an interface is, depending on the condition that is satisfied, either:
</p>

<ol>
<li>
the type <code>U</code>; or
</li>
<li>
the type <code>chan E</code> if <code>T</code> contains only bidirectional
channels, or the type <code>chan&lt;- E</code> or <code>&lt;-chan E</code>
depending on the direction of the directional channels present.
</li>
</ol>