[lang] Should ObjectUtils.Null provide toString(), hashCode() & equals() ?

[Jason Dillon]

Should ObjectUtils.Null provide toString(), hashCode() & equals() as 
such:

   public String toString() {
      return null;
   }
   public int hashCode() {
      return 0;
   }
   public boolean equals(final Object obj) {
      if (obj == this) return true;
      return (obj == null || obj.getClass() == getClass());
   }
?

--jason

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