HTTP 422 Unprocessable Content @ RFC 9110 (HTTP Semantics) seems missing?

[holtkamp]

HTTP 422 is exposed as Unprocessable Entity via the WebDAV extension (RFC 4918)

status-code/src/RFC/RFC4918.php

Line 83 in 62cba6f

public const UNPROCESSABLE_ENTITY = 422;

https://datatracker.ietf.org/doc/html/rfc4918/#section-11.2

But since 2022 it is also published in RFC 9110 (HTTP Semantics) which seems to be missing in this library, is that correct?

https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.21

Rationale: it would be nice to be able to use \Teapot\StatusCode\Http::UNPROCESSABLE_CONTENT