Relax ProtocolType requirement on ProtocolObject
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These Sized bounds are already added by the extern_protocol! macro
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ProtocolObject with multiple protocolsProtocolType requirement on ProtocolObject
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This allows us to do `ProtocolObject<dyn ProtocolA + ProtocolB>` in the future.
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Relax the
ProtocolTyperequirement onProtocolObject, which means we can now have protocol objects with auto traits, such asProtocolObject<dyn NSObjectProtocol + Send>.Protocols objects with multiple protocols are not yet possible.
Construction of these is still difficult, we'd have to somehow do
impl ImplementedBy<T: Any + Combination + Of + Traits> for dyn Any + Combination + Of + Traits. But I suspect construction of these will be exceedingly rare anyhow, and at least it's better that you can use them, ificrateconstructs them for you.TODO: