I notice there are no references to register_instance in this library. Are instances (and instance handles) supported by this wrapper currently? Specifically "deleting" a sample from the DDS data space (dispose_instance_handle).

I notice in dds_derive we have:

fn is_key(field : &Field) -> bool {
    for attr in &field.attrs {
        if let Some(ident) = attr.path.get_ident() {
            if ident == "topic_key" || ident == "topic_key_enum"{
                return true
            }
        } 
    }
    false
}

implying that they might be supported for well-known field names only. If that's the case, is there any way to customize serialized field names? Which is relevant for hashed autoid field names