Thanks JS.
I know the @id is not an URL and simply an identifier. But if you are using it, why not use the original URL (with a slash at the end).
As said, I see crawls now by Google, thinking it is an URL they don’t know yet. Which is a shame, as it will be responded to with a 301 and redirect to the ‘right’ URL. You said you removed the slash in the next version. But as it was already missing, do you mean you added it? ??
It might be good to look beyond what WordPress itself is doing, as this is about the contextual meaning of the list and their items. Personally, I would give it the “Unordered”, as the items may be ordered by WordPress, but contextually they are not. They are simply blog posts grouped together by the same tag or category. It would be different if it were particular historic events (ordered by date) or a top 10 list (specifically ordered by their position from 1 to 10).
Cheers,
Michael