     {
         super();
     }
-    
+
     /**
      *  @private
      *  Used for accessing localized Error messages.
      */
     private var resourceManager:IResourceManager =
                                     ResourceManager.getInstance();
-    
+
     /**
-     *  Returns the singleton of this class. 
+     *  Returns the singleton of this class.
      *  Since all NumberInterpolators
      *  have the same behavior, there is no need for more than one instance.
-     *  
+     *
      *  @langversion 3.0
      *  @playerversion Flash 10
      *  @playerversion AIR 1.5


    /**
     *  @inheritDoc
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5


    /**
     *  Interpolation for NumberInterpolator consists of a simple
     *  parametric calculation between <code>startValue</code> and
     *  <code>endValue</code>, using <code>fraction</code> as the
     *  fraction of the elapsed time from start to end:
     *
     *  <pre>return startValue + fraction * (endValue - startValue);</pre>
     *
     *  @param fraction The fraction elapsed of the
     *  animation, between 0.0 and 1.0.
     *
     *  @param startValue The start value of the interpolation.
