ruststream 0.4.0

Async messaging framework for Rust: broker-agnostic traits, router, codecs, and a conformance harness for broker authors.
Documentation 
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error: batch(..) takes exactly one source argument
 --> tests/ui/subscriber_batch_two_args.rs:4:14
  |
4 | #[subscriber(batch("a", "b"))]
  |              ^^^^^^^^^^^^^^^