anchor.diff:              - `USER_CREATE_INVALID_USERNAME` if the supplied `username` does not match the given criteria (regex: ^[a-zA-Z0-9\-\.]{3,20}$)
               - `USER_CREATE_INVALID_PASSWORD` if the supplied `password` does not satisfy the given criteria (regex: ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$)
               - `USER_CREATE_INVALID_EMAIL` if the supplied `email` is not a valid email
  -            - `REQUEST_UNSUPPORTED_CONTENT_TYPE` if the submitted content and/or Content-Type is not `application/json`
  +            - `REQUEST_MALFORMED_DATA` if the submitted data in the request body does not match the Content-Type or is unparseable
  +
  ++ Response 406 (application/json)
  +    + Attributes (object)
  +        + status (string) - Textual description of the HTTP status
  +        + message (string) - Detailed error information, e.g. hint about malformed request
  +        + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  +
  +            A comprehensive list of possible errors:
  +            - `REQUEST_UNSUPPORTED_CONTENT_TYPE` if the submitted Content-Type is not `application/json`
   
   + Response 422 (application/json)
       + Attributes (object)
  
positive.code:             - `USER_UPDATE_INVALID_PASSWORD` if the supplied `password` does not satisfy the given criteria (regex: ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$)
              - `USER_UPDATE_INVALID_EMAIL` if the supplied `email` is not a valid email
              - `USER_UPDATE_INVALID_RANK` if the supplied `rank` is not a valid rank (regex: ^[1-3]$)
              - `REQUEST_UNSUPPORTED_CONTENT_TYPE` if the submitted content and/or Content-Type is not `application/json`
  
  + Response 401 (application/json)
      + Attributes (object)
  
negative.code:             - `ENTRY_INVALID_DESCRIPTION` if the submitted `description` is malformed (regex: ^[\s\S]{3,}$)
              - `ENTRY_INVALID_TAG` if one of the submitted `tags` is malformed (regex: ^[a-z0-9\-\.]{3,20}$)
              - `ENTRY_INVALID_CONFIGURATION` if the submitted configuration snippet has an unsupported format
              - `REQUEST_MALFORMED_DATA` if the submitted data in the request body does not match the Content-Type or is unparseable
  
  + Response 401 (application/json)
      + Attributes (object)
  