code: function(compute, newValue, oldValue, batchNum){
  
  	var valueChanged = newValue !== oldValue && !(newValue !== newValue && oldValue !== oldValue);
  	// Only trigger event when value has changed
  	if (valueChanged) {
  		compute.dispatch({type: "change", batchNum: batchNum}, [
  			newValue,
  			oldValue
  		]);
  	}
  }
docs: ## updateOnChange A helper to trigger an event when a value changes