docs: def rel_path_to(self, dest):
          """Builds a relative path leading from this one to the given `dest`.
  
          Note that these paths might be both relative, in which case they'll be
          assumed to start from the same directory.
          """
          dest = self.__class__(dest)
  
          orig_list = self.norm_case()._components()
          dest_list = dest._components()
  
          i = -1
          for i, (orig_part, dest_part) in enumerate(zip(orig_list, dest_list)):
              if orig_part != self._normcase(dest_part):
                  up = ['..'] * (len(orig_list) - i)
                  return self.__class__(*(up + dest_list[i:]))
  
          if len(orig_list) <= len(dest_list):
              if len(dest_list) > i + 1:
                  return self.__class__(*dest_list[i + 1:])
              else:
                  return self.__class__('')
          else:
              up = ['..'] * (len(orig_list) - i - 1)
              return self.__class__(*up)