Clarification requested on how to implement "not mapped" aria-sort=none for NSAccessibility's accessibilitySortDirection #239

According to the spec, aria-sort=none for NSAccessibility is "not mapped".

But it's not clear to me how to implement that for accessibilitySortDirection, because the only available NSAccessibilitySortDirections are:

• unknown
• ascending
• descending

The first of those three is the expected mapping for aria-sort=other. And an unknown sort order isn't the same thing as the known lack of a sort order (right?).

I suppose an implementation could just not support accessibilitySortDirection until the items in question become sorted. But that feels not-quite-right to me. Things that can never be sorted should of course not support accessibilitySortDirection. However, it seems like things which could be sorted and just happen to be unsorted should support accessibilitySortDirection.

Whatever the correct implementation should be, having it stated in the Core-AAM would be helpful. Guidance in the meantime would be most appreciated! Thanks in advance!