docs: public static EightyPath toRealPath( Path path ) {
          if( !( path instanceof EightyPath ) ) {
              throw new IllegalArgumentException( path + " should be EightyPath" );
          }
  
          EightyPath eightyPath = (EightyPath) path;
  
          if ( eightyPath.knownReal() ) {
              return eightyPath;
          }
  
          return new RealPath( eightyPath ).to();
      }