[iainmerrick]

Structs with mutable fields is hardly “ultimate low level optimization”, it’s something a lot of programmers still use as a matter of course. (I say this as a fan of immutable data!)

Ultimate low-level optimization in Java would be more like packing your structure into arrays of integers - which is something people actually do in Java. Just because you’re using Java doesn’t mean you don’t want your code to run as fast as possible.