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adsl-75-3-115-48:rubinius brixen$ shotgun/rubinius
irb(main):001:0> [0xff00_ff00].pack("i")
=> "\000\377\000\377"
irb(main):002:0> [0xff00_ff00].pack("I")
=> "\000\377\000\377"
irb(main):003:0> ^D

adsl-75-3-115-48:rubinius brixen$ irb
>> [0xff00_ff00].pack('i')
=> "\377\000\377\000"
>> [0xff00_ff00].pack('I')
=> "\377\000\377\000"