def get_object(offset)
      io = to_shm_io
      io.seek(offset)
      Marshal.load(io)
    end
def get_object(offset)
      io = to_shm_io
      io.seek(offset)
      Marshal.load(io)
    end
Read the serialized object at +offset+ (in bytes) using
 Marshal.load.

 @return [Object]