Changed check for required properties on `change` requirement of instanceof Diff is way to strong
Changed check for required properties on `change`
requirement of instanceof Diff is way to strong

CashStar/diff,theSmaw/diff,GerHobbelt/diff,kindziora/diff,flitbit/diff,theSmaw/diff,dgillis/diff,qweasd1/diff,flitbit/diff,dgillis/diff,kindziora/diff,GerHobbelt/diff,qweasd1/diff,CashStar/diff