Hey,
The upcoming 1.0 version of DataModel makes a breaking change to the setLabel, setDescription and setAliasGroup methods of Fingerprint [0]. This means that for now it is best to refrain from using these convenience methods, as it makes migration to 1.0 harder.
[0] https://github.com/wmde/WikibaseDataModel/blob/master/RELEASE-NOTES.md
Cheers
-- Jeroen De Dauw - http://www.bn2vs.com Software craftsmanship advocate Evil software architect at Wikimedia Germany ~=[,,_,,]:3