This patch was authored by @Joannis and released by @0xTim.
When communicating with API's following the JSON API format, these API's emit a content-type of vnd.api+json. This content type is always used with JSON formatted responses, although they follow a certain JSON format. I think it's therefore helpful to provide a default encoder/decoder for this media type.
I'm not sure if this would be a semver-patch or semver-minor as it's additive behaviour but doesn't touch public API.