 
     it 'turns the value into a string', ->
       Z(1).toString().should.become "1"
-


    it 'fails given an object', ->
      Z({}).filter((x) -> x).should.be.rejected


  describe 'join', ->


      Z("foobar").keys().should.be.rejected



describe 'underscore method each', ->

  describe 'keys', ->
