On November 1, 2018 we will begin to validate request payloads more strictly.
Calls that previously returned a 2xx success code, may return a 422 Unprocessable Entity.
As previously announced, we will be begin to validate request payloads more strictly in the REST API starting on November 1, 2018. You can opt into the new validations by sending the
application/vnd.github.speedy-preview+json preview header.