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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.
    
An old numeric_cast that was contributed by Kevlin Henney is now superseeded by the Boost Numeric Conversion Library