[image] How is the comparison made here? Is this something might present a problem in shipping build? Any reason to not use this instead of a cast or interface?

This compare pointers if they point to the same object ( Virtual Memory Address ). It only works if you want to check if it’s the same object. This is common even in C++. The actual machine code doesn’t need to worry about type because they don’t need to dereference to class’s member, method etc …