- Added a alpha feature, behind the `RelaxedEnvironmentVariableValidation` feature gate.
  When that gate is enabled, Kubernetes allows almost all printable ASCII characters to be used in the names
  of environment variables for containers in Pods. ([#123385](https://github.com/kubernetes/kubernetes/pull/123385), [@HirazawaUi](https://github.com/HirazawaUi))

    <magic priority="50">
      <match value="AutoCAD Binary DXF\r\n0x1A00" type="string" offset="0"/>
    </magic>
  </mime-type>
  <mime-type type="image/vnd.dxf;format=ascii">
    <sub-class-of type="image/vnd.dxf"/>
    <_comment>AutoCAD DXF in ASCII Text form</_comment>
    <magic priority="50">
      <!-- Variable number of spaces or possibly creator tool before the code groups -->

<code>'ä'</code> holds two bytes (<code>0xc3</code> <code>0xa4</code>) representing
a literal <code>a</code>-dieresis, U+00E4, value <code>0xe4</code>.
</p>

<p>
Several backslash escapes allow arbitrary values to be encoded as
ASCII text.  There are four ways to represent the integer value
as a numeric constant: <code>\x</code> followed by exactly two hexadecimal
digits; <code>\u</code> followed by exactly four hexadecimal digits;

* 📝 Update docs for handling HTTP Basic Auth with `secrets.compare_digest()` to account for non-ASCII characters. PR [#3536](https://github.com/tiangolo/fastapi/pull/3536) by [@lewoudar](https://github.com/lewoudar).