# File lib/mini_profiler/gc_profiler.rb, line 37
  def diff_object_stats(before, after)
    diff = {}.compare_by_identity
    after.each do |k,v|
      diff[k] = v - before[k]
    end
    before.each do |k,v|
      diff[k] = 0 - v unless after.has_key?(k)
    end

    diff
  end