It's sometimes useful to have versions of similar/related components in sibling directories (e.g. mystuff/proj_v1 and mystuff/proj_v2), and to have a single tags file that covers all such directories.
It would be useful in that case to be able to specify that a given component is the preferred location when a symbol occurs in multiple places.
That would mean that going to the tag would by default take me to the most recent definition, but allow me to easily look back through history as needed.
Currently, the output seems to be sorted alphabetically, which means v1 (the older definition) gets found first.