Seems like a bit of a stretch to say that anything that's part of a method signature is the same as a "color" as it was described in the original article. If a

Seems like a bit of a stretch to say that anything that's part of a method signature is the same as a "color" as it was described in the original article. If a method takes something by value, that doesn't necessarily mean that attribute needs to propagate up the call chain until the literal origin of the process. In fact, in my experience, it _very_ rarely does. Async does, however, always. That's the whole point.