Hi!
All of which does raise a slightly different question: I am much less clear on what the exact difference is between “Invalid” and “Declined.” Thoughts?
I usually use Invalid where the description of the task does not really describe the problem (or a problem) - e.g. it was a user error, misconfiguration, misunderstanding about how it should have worked, transient condition that has passed and we can not do anything about it, something that is outside of realm of possibilities for us to do (e.g. "fix copyright laws"), a task created by mistake, etc. For TODO tasks, Invalid would be when the task is describing something that can not be done at all (at least by us), or would not produce any desirable result.
Declined is when it describes a valid task in general, but we are not going to do it because of reasons.