[css-grid-3] Does reversing reverse placement only or also line/track ordering?

From @celestepan's https://github.com/w3c/csswg-drafts/issues/12803#issuecomment-3387605000

In masonry, if we go with option 2, the behavior is exactly analogous: row-reverse places items right-to-left instead of left-to-right across the columns, and wrap-reverse stacks them up instead of down.

Regardless of the naming, for implementations where we change the direction in which we're placing items across tracks (in columns, if we place items right-to-left, in rows, if we place items bottom-up), would we want to reverse the line names / line indices as well?

If we have 4 lines, would line 1 still be the left-most line, or would the right-most line become line 1?

When we talked about reversing originally, I don't think we explicitly considered this aspect of it when adding these values in #3622. What should happen? Do we have use cases to help us determine that?

Start with the referenced comment in issue #12803 and the earlier discussion in #3622. Compare the proposed reversing behavior for placement with its effect on line names and indices, and look for use cases that resolve the question. Done means the CSS Grid 3 behavior is decided and clearly documented.