code: func (c *IterateChain) AllValues(qs QuadStore) ([]quad.Value, error) {
  	var out []quad.Value
  	err := c.EachValue(qs, func(v quad.Value) {
  		out = append(out, v)
  	})
  	return out, err
  }
docs: // AllValues is an analog of All, but it will additionally call NameOf
  // for each graph.Value before returning the results slice.