Function signed_update_inspect

pub fn signed_update_inspect(
    sender: Principal,
    canister_id: Principal,
    method_name: &str,
    arg: &[u8],
    ingress_expiry: u64,
    signed_update: Vec<u8>,
) -> Result<(), AgentError>

Inspect the bytes to be sent as an update Return Ok only when the bytes can be deserialized as an update and all fields match with the arguments