what sort of efficiency are you wondering about? Here's what's on the WASM side of my proof of concept (I just copied the type definition over)
```
#[wasm_bindgen]
pub fn eui_serialize(s: &str) -> Option<Vec<u8>> {
    serde_json::from_str::<Light>(s)
        .ok()
        .and_then(|x| postcard::to_stdvec_cobs(&x).ok())
}

#[wasm_bindgen]
pub fn eui_schema() -> String {
    use postcard::experimental::schema::Schema;
    serde_json::to_string_pretty(Light::SCHEMA).unwrap()
}

```

Those functions are called by the ClojureScript.