Of course you can get the disassembly of JITed code from Hotspot too, and the effects of boxed math are quickly visible. Escape analysis may help in the future,

Of course you can get the disassembly of JITed code from Hotspot too, and the effects of boxed math are quickly visible. Escape analysis may help in the future, if it can be made more general. While I consider type hinting an uglyish wart to work around limitations of the underlying VM, I also secretly wish we had such an escape hatch in JRuby. Oh well.