Jruby ArrayList multiple assignment

gistfile1.txt

Current behavior:

$ irb
jruby-1.7.1 :001 > require 'java'
 => false 
jruby-1.7.1 :002 > java_import 'java.util.ArrayList'
 => [Java::JavaUtil::ArrayList] 
jruby-1.7.1 :003 > a = ArrayList.new
 => #<Java::JavaUtil::ArrayList:0x12910b0b> 
jruby-1.7.1 :004 > a << 1 << 2
 => #<Java::JavaUtil::ArrayList:0x12910b0b> 
jruby-1.7.1 :005 > b, c = a
 => [#<Java::JavaUtil::ArrayList:0x12910b0b>] 
jruby-1.7.1 :006 > puts b
[1, 2]
 => nil 
jruby-1.7.1 :007 > puts c

 => nil 

Expected behavior:

jruby-1.7.1 :008 > class ArrayList
jruby-1.7.1 :009?>   alias_method :to_ary, :to_a
jruby-1.7.1 :010?>   end
 => Java::JavaUtil::ArrayList 
jruby-1.7.1 :011 > a = ArrayList.new
 => #<Java::JavaUtil::ArrayList:0x10fa1b2d> 
jruby-1.7.1 :012 > a << 1 << 2
 => #<Java::JavaUtil::ArrayList:0x10fa1b2d> 
jruby-1.7.1 :013 > b, c = a
 => [1, 2] 
jruby-1.7.1 :014 > puts b
1
 => nil 
jruby-1.7.1 :015 > puts c
2
 => nil