anchor.diff:          %% readable file on XRootD would result in a file which is readable for
           %% all users, but file which is writeable in XRootD will be only
           %% writeable by user and group.
  -        fileModeMask => {string, optional},
  +        fileModeMask => {string, {optional, <<"0664">>}},
           %% Defines the directory permissions mask, which is used to map XRootD
           %% dir mode to POSIX mode. For instance a dirModeMask `0770`
           %% for readable directory on XRootD would result in a directory which is
           %% readable for owner and group but not for others.
  -        dirModeMask => {string, optional},
  +        dirModeMask => {string, {optional, <<"0775">>}},
           %% Determines how the logical file paths will be mapped on the storage.
           %% 'canonical' paths reflect the logical file names and
           %% directory structure, however each rename operation will require
  
positive.code:         bucketName => string,
          %% The version of signature used to sign requests. One of: 2, 4.
          %% Default: 4.
          signatureVersion => {integer, optional},
          %% Storage block size in bytes. In case the block size is `0`
          %% and `canonical` path type is selected, each file is stored
          %% in a single S3 object. This value must be set to `0` to
          %% enable data import from an existing S3 bucket.
          blockSize => {integer, optional},
          %% Defines the maximum size for objects, which can be modified on the S3
          %% storage in `canonical` path mode. In this mode, entire file
          %% needs to be downloaded to memory, modified and uploaded back, which
  
negative.code:         %% This field can contain any prefix that should be added to the header
          %% value. Default is `Authorization: Bearer {}`. The token
          %% will placed where `{}` is provided.
          authorizationHeader => {string, {optional, <<"Authorization: Bearer {}">>}},
          %% The type of partial write support enabled in the WebDAV server.
          %% Currently 2 types are supported `sabredav` which assumes
          %% the server supports the SabreDAV PartialUpdate extension via
  