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/// Self-explanatory.
Invoke(Envelope<Invocation, Result<HttpRes, InvocationError>>),
/// Self-explanatory. We're only passing in a payload and a serialized reply which the core won't need to deserialize, thus we use `Vec<u8>` rather than complex types.
Invoke(Envelope<Vec<u8>, Vec<u8>>),
/// `T` and `U` must be `Send`.
/// An envelope is a pair of some request type `T` and a sender for the `U` reply to it, like the return address on a physical mail envelope.
///
/// `T` and `U` must be `Send`.