Last modified: 2013-06-26 12:34:32 UTC
If you enter a year and switch the precision to "decade" something like e.g. "1980s" will be displayed. If you edit this value later you are not able to change it to e.g. "1970s" because at the moment it is not possible to enter a decade (it gives you a "no valid value recognized" message).
Related URL: https://gerrit.wikimedia.org/r/69866 (Gerrit Change I370a3709cb28e2537f597dc69e74eb500163efd3)
Verified in Wikidata demo sprint 22-9