docs: def depends_on(self, *keys):
          '''
          Decorator that marks the wrapped as depending on specified provider keys.
  
          :param keys: Provider keys to mark as dependencies for wrapped
          :type keys: tuple
          :return: decorator
          :rtype: decorator
          '''
  
          def decorator(wrapped):
              if keys:
                  if wrapped not in self._dependencies:
                      self._dependencies[wrapped] = set()
                  self._dependencies[wrapped].update(keys)
              return wrapped
  
          return decorator