rbx JIT/kwargs bug

kw.rb

def kw(a: 0); end
N = Integer(ARGV[0]) rescue 250_000
N.times { kw }

log.txt

$ rbx -v
rubinius 2.3.0.n304 (2.1.0 f129cf10 2014-10-31 3.5.0 JI) [x86_64-darwin13.4.0]


$ rbx kw.rb
An exception occurred running kw.rb:

undefined method `to_hash' on 21474836793:Fixnum. (NoMethodError)

Backtrace:

  Kernel(Fixnum)#to_hash (method_missing) at kernel/delta/kernel.rb:78
                                Object#kw at kw.rb:1
                 { } in Object#__script__ at kw.rb:3
                    Integer(Fixnum)#times at kernel/common/integer.rb:196
                        Object#__script__ at kw.rb:3
         Rubinius::CodeLoader#load_script at kernel/delta/code_loader.rb:66
         Rubinius::CodeLoader.load_script at kernel/delta/code_loader.rb:152
                  Rubinius::Loader#script at kernel/loader.rb:645
                    Rubinius::Loader#main at kernel/loader.rb:799


$ RBXOPT='-Xint' rbx kw.rb
# runs fine