docs: def store_value(self, name, value, parameters=None):
          """Stores the value of a certain variable
  
          The value of a variable with name 'name' is stored together with the parameters that were used for the
          calculation.
  
          :param str name: The name of the variable
          :param value: The value to be cached
          :param dict parameters: The parameters on which the value depends
          """
          if not isinstance(parameters, dict):
              raise TypeError("parameters must be a dict")
          hash = self._parameter_hash(parameters)
          if name not in self._cache:
              self._cache[name] = {}
          self._cache[name][hash.hexdigest()] = value