As a special case, if the destination's core type is <code>[]byte</code>,
<code>copy</code> also accepts a source argument with core type
<a href="#Core_types"><code>bytestring</code></a>.
This form copies the bytes from the byte slice or string into the byte slice.
</p>

<pre class="grammar">
copy(dst, src []T) int
copy(dst []byte, src string) int
</pre>

<p>
Examples:
</p>

<pre>

### Fixes

* ⬆ Upgrade Swagger UI copy of `oauth2-redirect.html` to include fixes for flavors of authorization code flows in Swagger UI. PR [#3439](https://github.com/tiangolo/fastapi/pull/3439) initial PR by [@koonpeng](https://github.com/koonpeng).