docs: def forever(self, key, value):
          """
          Store an item in the cache indefinitely.
  
          :param key: The cache key
          :type key: str
  
          :param value: The value
          :type value: mixed
          """
          namespace = self._tags.get_namespace()
  
          self._push_forever_keys(namespace, key)
  
          self._store.forever(
              '%s:%s' % (hashlib.sha1(encode(self._tags.get_namespace())).hexdigest(), key),
              value
          )