1. [1] pry(main)> k = {'%u9E80'=>'moi'}
  2. => {"%u9E80"=>"moi"}
  3. [2] pry(main)> pp Hash[k.map{|k,v|[k[2..-1].to_i(16).chr('utf-8'), v]}]
  4. {"麀"=>"moi"}
  5. => {"麀"=>"moi"}
  6. [3] pry(main)>