pub fn serialize<T, S>(
    value: &Option<T>,
    serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
    S: Serializer,
    T: Serialize,pub fn serialize<T, S>(
    value: &Option<T>,
    serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
    S: Serializer,
    T: Serialize,