docs: public static <T1, T2> FluentFunctions.FluentBiFunction<T1, T2, Tuple2<T1, T2>> checkedExpression(final CheckedBiConsumer<T1, T2> action) {
          final BiConsumer<T1, T2> toUse = ExceptionSoftener.softenBiConsumer(action);
          return FluentFunctions.of((t1, t2) -> {
              toUse.accept(t1, t2);
              return Tuple.tuple(t1, t2);
          });
      }