Strict long type casting

[Ty Young]

Hi all,


I'm trying to create a way of reading primitive number based struct 
values(since VarHandle.get is polymorphic) by combining Java's Number 
abstract class with my abstraction like so:


public abstract class MemoryNumber<E extends Number> extends Number 
implements MemoryValue<E>


Which is then extended by classes like "MemoryLong".


The problem here is that with long(and only long) the type casting is 
strict and fails. Attempting to call byteValue() fails on intValue(). 
This doesn't, for whatever reason, happen with normal on-heap long 
values nor does it happen with an MemoryInt implementation either.


I tried looking in the source code of Long.class and I couldn't find 
anything that I was doing differently besides using Panama, so I'm a bit 
lost here. Does anyone know what's going on?