Re: - https://github.com/json-api/json-api/pull/440 - http://jsonschemalint.com/draft4/# - https://github.com/json-api/json-api/blob/6a410c0068dcce1813ac4c0b5a875adbef759729/faq/index.md#is-there-a-json-schema-describing-json-api- If so, how would one help going about that? What's the source of truth to validate it against?