Caddy 2 handle_error examples with custom error pages?

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So currently, the only way to do it is using the still experimental CEL expression matcher feature. Just gave it a quick go, it looks something like this:

handle_errors {
	@404 {
		expression int({http.error.status_code}) == 404
	}
	respond @404 "Four Oh Four"
}

Edit: Did a bit more experimentation, this also works:

expression {http.error.status_code} == '404'

There’s some finickiness with types (Caddy placeholders only output strings) and double quotes (" is parsed by Caddy and gets stripped before it hits CEL), but single quotes ' get passed through just fine and CEL handles it as a string as well.