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      polymorphic_cast was suggested
      by Bjarne Stroustrup in "The C++ Programming Language".
    
      polymorphic_downcast was contributed
      by Dave Abrahams.
    
      polymorphic_pointer_downcast
      was contributed by Boris
      Rasin and polymorphic_pointer_cast
      by Antony Polukhin.
    
      polymorphic_downcast overload
      for references was contributed by Julien Delacroix.
    
      An old numeric_cast that was
      contributed by Kevlin
      Henney is now superseded by the Boost
      Numeric Conversion Library