add an abstraction with more info on how to interpret "reference" data.

[porres]

This would add and better explain special cases, so we don't need to give redundant information. The abstraction would reside under the reference subpacthes.

It would then specify what are the usual Pd messages and explain what "anything" means (and what it means is that it is "anything else" or generic messages, but it can also mean "all messages").

This would also say that when there's not a list method that you'd expect list messages to fan out in the inlets. And if you have only one inlet, it would then consider the first element of the list.

I need to elaborate more on this.