irb(main):019:0> bar = Object.new
=> #<Object:0x101d931c>
irb(main):020:0> bar.inspect
=> "#<Object:0x101d931c>"
irb(main):021:0> bar = WeakRef.new(bar)
orig: 135186830
=> #<Object:0x101d931c>
irb(main):022:0> bar.inspect
=> "#<Object:0x101d931c>"