 
   setNotANumberSymbol: (notANumberSymbol) ->
     @_notANumberSymbol = notANumberSymbol
+    return this
 
   nullSymbol: ->
     @_get 'nullSymbol'
 
   setNullSymbol: (nullSymbol) ->
     @_nullSymbol = nullSymbol
+    return this
 
   numberStyle: ->
     @_numberStyle


  setNegativeInfinitySymbol: (negativeInfinitySymbol) ->
    @_negativeInfinitySymbol = negativeInfinitySymbol

  negativePrefix: ->
    @_get 'negativePrefix'


  setUsesGroupingSeparator: (usesGroupingSeparator) ->
    @_usesGroupingSeparator = usesGroupingSeparator
    return this

  zeroSymbol: ->
    @_get 'zeroSymbol'

  setZeroSymbol: (zeroSymbol) ->
    @_zeroSymbol = zeroSymbol
    return this

  _get: (attr) ->
    value = this["_#{attr}"]
