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Adds to @suhlig's PR by adding an A (for Arguments) parameter, so that the type of actions and guards can be fully type specified.
Also added an "Args" helper type, that preserves the old behavior of using reflect.TypeOf in order to do dynamic typing if desired.
I'm not certain that I fully like this implementation, or that the addition of having typing for the arguments outweighs the relative added complexity of smuggling an "A" around all over the code. On the other hand, for the typical kind of application I've been using stateless for, I often have the same or a very similar argument for all the times I actually need an argument, and nothing at all the rest of the time.