Class DurationProxy

cel/src/ser.rs:90–90

chrono::Duration's Serialize impl isn't stable yet and relies on private fields, so attempt to mimic serde's default impl for std Duration.

        // private fields, so attempt to mimic serde's default impl for std
        // Duration.
        struct DurationProxy(chrono::Duration);
        impl Serialize for DurationProxy {
            fn serialize<S: ser::Serializer>(
                &self,