docs: @PublicEvolving
  	public <R> SingleOutputStreamOperator<R> process(KeyedProcessFunction<KEY, T, R> keyedProcessFunction) {
  
  		TypeInformation<R> outType = TypeExtractor.getUnaryOperatorReturnType(
  				keyedProcessFunction,
  				KeyedProcessFunction.class,
  				1,
  				2,
  				TypeExtractor.NO_INDEX,
  				getType(),
  				Utils.getCallLocationName(),
  				true);
  
  		return process(keyedProcessFunction, outType);
  	}