code: @Nonnull
  	public static <T1, T2> ToDoubleBiFunctionBuilder<T1, T2> toDblBiFunction(Consumer<ToDoubleBiFunction<T1, T2>> consumer) {
  		return new ToDoubleBiFunctionBuilder(consumer);
  	}
docs: One of ways of creating builder. This might be the only way (considering all _functional_ builders) that might be utilize to specify generic params only once.