Why does returning fail in form action use HTTP status code 200?

[alexbjorlig]

I'm starting to implement a bunch of forms using Sveltekit and wonder, why do we return HTTP status code 200 with this code?

return fail(400, { form })

Would it not be more correct from an HTTP perspective to return status code 400)?

[eltigerchino]

Here is a previous discussion I've found on the matter #7233 (comment)