docs: def get_rel_sciobj_file_path(pid):
      """Get the relative local path to the file holding an object's bytes.
  
      - The path is relative to settings.OBJECT_STORE_PATH
      - There is a one-to-one mapping between pid and path
      - The path is based on a SHA1 hash. It's now possible to craft SHA1 collisions, but
        it's so unlikely that we ignore it for now
      - The path may or may not exist (yet).
  
      """
      hash_str = hashlib.sha1(pid.encode('utf-8')).hexdigest()
      return os.path.join(hash_str[:2], hash_str[2:4], hash_str)