fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, DeError>
    where
        V: Visitor<'de>,
    {
        match self.peek()? {
            DeEvent::Text(t) if t.is_empty() => visitor.visit_none(),
            DeEvent::CData(t) if t.is_empty() => visitor.visit_none(),
            DeEvent::Eof => visitor.visit_none(),
            _ => visitor.visit_some(self), // <<< Forwarding deserialization to another deserializer
        }
    }