I have a class which I cannot edit with the following constructor:

    /**
     * @param int|null $maxBodyLength
     * @param string   $binaryDetectionRegex By default, this is all non-printable ASCII characters and <DEL> except for t, r, n
     */
    public function __construct($maxBodyLength = 1000, string $binaryDetectionRegex = '/([x00-x09x0Cx0E-x1Fx7F])/')
    {
        $this->maxBodyLength = $maxBodyLength;
        $this->binaryDetectionRegex = $binaryDetectionRegex;
    }

Using services.xml I want to set maxBodyLength to null. Doing this works:

    <service id="meteor.api_logger.formatter" class="HttpMessageFormatterFullHttpMessageFormatter">
        <argument>null</argument>
    </service>

But when I use a named parameter as preferred I get an error:

    <service id="meteor.api_logger.formatter" class="HttpMessageFormatterFullHttpMessageFormatter">
        <argument key="$maxBodyLength">null</argument>
    </service>

In AbstractRecursivePass.php line 174:

  Invalid service "meteor.api_logger.formatter": class "HttpMessageFormatterFullHttpMessageFormatter" does not exist.

Already tried:

• Also passing the other argument in services.xml
• Removing $ from the key
• Using 0 instead of null
• Using <argument key="$maxBodyLength"/>

All gave the same error. How to use named arguments to pass value null?