Type Alias BoxedFunctionHandler 

pub type BoxedFunctionHandler = Box<dyn DynAsyncFunctionHandler + Send + Sync>;

Boxed handler stored in the engine’s function registry. Users construct these with Box::new(MyHandler) — the blanket impl above auto-coerces any AsyncFunctionHandler into Box<dyn DynAsyncFunctionHandler + Send + Sync>.

Aliased Type

pub struct BoxedFunctionHandler(/* private fields */);