in Dataset/JS/AngularCalendar/calendar.js [59:67]
this.sourceFingerprint = function (source) {
var fp = '' + (source.__id || (source.__id = sourceSerialId++));
var events = angular.isObject(source) && source.events;
if (events) {
fp = fp + '-' + (events.__id || (events.__id = sourceEventsSerialId++));
}
return fp;
};