This seems like a dumb question, but I’ve been unable to find an answer. Does
the RPC system support null values? In particular, if an RPC method returns an
interface, is it able to return null?
Say Widget is an interface, and in another interface I’ve got a method
widgetNamed @1 (name: String) -> (widget: Widget);
Can this method return null? I’m beginning to suspect it can’t, because when it
tries to I get an error "Pipeline call on a request that returned no
capabilities or was already closed”. (The implementation is in C++; to return
null it just abstains from calling context.getResults().setWidget().)
If it can’t, what is the idiomatic way to provide an optional return value? Do
I return an exception, or do I create my own `Optional` type as a union?
—Jens
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