This could be implemented in a straightforward manner similar to 843c9d1 (distribute excess width to each column proportionally), but I think it would be semantically different than how it works in traditional tbl which adjusts column separations instead.
This could be implemented in a straightforward manner similar to 843c9d1 (distribute excess width to each column proportionally), but I think it would be semantically different than how it works in traditional tbl which adjusts column separations instead.