Does required and optional apply to categorical output types

[annakrystalli]

Given probabilities across all possible categories sum to 1, it doesn't make much sense to me to have some categories optional and some required?

If anything feels like they should either all be required or all optional (with any missing assumed to be 0 probability) so long as what is provided sums to one?

[annakrystalli]

Also, examples of possible categories welcome!

[nickreich]

I like a plan where all categories are optional (with any missing assumed to be 0 probability) with a check that the probabilities provided sum to one.

Some example categories:
Example 1, like a level of incidence : ["low", "moderate", "high", "extreme"]
Example 2, like a trend: ["flat", "increasing", "decreasing"]

[annakrystalli]

Closed via #11