Frankly put, we haven't tested this scenario using GUID values, but you can try to change the logic to use GUID instead of integers and theoretically it should work the same way:
public ActionResult Orders_ValueMapper(int[] values)
Regards,
Eyup
Progress Telerik
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.