FULL PRODUCT VERSION :
openjdk version "9.0.1"
OpenJDK Runtime Environment (build 9.0.1+11)
OpenJDK 64-Bit Server VM (build 9.0.1+11, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux jeffrey-XPS-8700 4.10.0-37-generic #41~16.04.1-Ubuntu SMP Fri Oct 6 22:42:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
A nashorn function that returns the "!!" of a variable returns false whenever that variable is even. It should only be false if it's 0.

jjs> (function(x) { return !!x })(8192)
false


REPRODUCIBILITY :
This bug can be reproduced always.