With it we can write {{fullurl:{{FINDVARIANTLINK:猫砂}}|variant=zh}} (see [[zh:WP:VPT:关于繁简标题]]), in order that we can get the same target as [[猫砂]].
Maybe it can be also called in {{fullurl: }} but I'm not sure whether it will break something.
Version: 1.18.x
Severity: enhancement