Function bind_validated 

pub fn bind_validated<V, E, H, Args>(
    handler: H,
) -> BoundHandler<Validated<V, E>>
where
    V: Validate<E::Req>,
    E: BindableEndpoint + HasReqType,
    E::Req: DeserializeOwned + Send + 'static,
    H: Handler<Args>,
    Args: 'static,

Bind a handler to a Validated<V, E> endpoint.

Deserializes the request body, runs the validator, and only calls the handler if validation passes. Returns 422 on validation failure.