Keep track of objects.
var guy = {
id: "f90fa3f0-7fc7-4d67-9fe4-376354c18a51",
name: "David",
gender: "male",
company: ""
};
trackable( guy );
guy.name = "Juniper";
guy.hasChanged().should.be.true;
guy.revertChanges();
guy.hasChanged().should.be.false;
guy.name.should.equal( "David" );