Alternatives to ProtocolObject
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madsmtm
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enhancement
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I suspect it may be possible for us to basically never need to use
ProtocolObject, but instead rely on the compiler to do the work of figuring out which traits are valid for which objects.In this PR I've experimented with
CoercedUnsizedforId, to show that it can indeed work through that. If we also changed message sending such that&dyn NSObjectProtocoltranslates toNonNull<AnyObject>, then using protocol objects would look very, very similar to normal Rust code (methods take&dyn MyProtocoland end up returningId<dyn MyProtocol>).One worry is that the vtable may be included in the final binary, that would have to be thoroughly tested beforehand.