QList function contains returns QBool instead of bool

The documentation (online and sdk provided) says the function QList< T >::contains( const T & value) returns bool but the actual code returns a QBool object. The issue I'm facing is that there isn't a constructor for QVariant with QBool. This leads to fact that I cannot call QSettings().setValue("foo", list.contains(something)) event thought a function with return type of bool should allow implicit constructor for QVariant to be called with a bool parameter.