anchor.diff:          %% LUMA API Key, must be identical with API Key in external LUMA
           %% service.
           lumaApiKey => {string, optional},
  +        %% The type of storage.
  +        type => {equal, <<"s3">>},
           %% The hostname of a machine where S3 storage is installed.
           hostname => string,
           %% The storage bucket name.
  
positive.code:         insecure => {boolean, optional},
          %% Defines whether storage is readonly.
          readonly => {boolean, optional},
          %% The type of storage.
          type => {equal, <<"nulldevice">>},
          %% If true LUMA and reverse LUMA services will be enabled.
          lumaEnabled => {boolean, optional},
          %% URL of external LUMA service
  
negative.code:         insecure => {boolean, optional},
          %% Defines whether storage is readonly.
          readonly => {boolean, optional},
          %% If true LUMA and reverse LUMA services will be enabled.
          lumaEnabled => {boolean, optional},
          %% URL of external LUMA service
  