Cite should show an error if a named <ref> is defined multiple times (with possible different text).
We identified this at dewiki as a relative often error with at least 12.000 occurrences.
Maybe at first there should be only a tracking category added.
car is red<ref name="car">source: red car</ref> car is blue<ref name="car">source: blue car</ref>
Effective reference: source: red car