hei motzi,
welcome to the beauty of type inference. a patch is not complete unless a type can be infered. this is a feature. a rather powerful one. in your case you made an explicit type annotation, but often you’d just have a node downstream, that implicitly propagates a specific type upstream and you don’t have to manually annotate anything. also instead of using an extra iobox you could have simply annotated the splicer loop output.
but then also let me point you at this wip:
those nodes should simplify using osc tremendously for many cases. would be great to hear your thoughts on those.