[swift-users] Restrict parameter to value type

[Martin Knabbe]

Is there a way to restrict the type of a parameter to value types only
(struct)? I know of Any and AnyObject, but I'm missing AnyValue.

How can I achieve something like the following, to make sure that the
parameter is immutable and has copy-on-write feature?

protocol Actor: class {
    func send(message: AnyValue)
}

I'm curious why AnyValue is missing. Can someone answer this?

Thanks in advance.

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