[ilyt]

I just wrote a bunch of separate short functions for different types (channels, slices, maps). There is more code duplication but code itself is simpler, and less boiler-platey and more embeddable.

For example

    out := MapSlice(
       func(i int) string { return fmt.Sprintf("-=0x%02x=-", i) },
       MapSlice(
          func(i int) int { return i + 1 },
          MapSlice(
             func(i int) int { return i * i },
             GenSlice(10, func(idx int) int { return idx }),
          ),
       ),
    )

or piping workers

    out :=
       WorkerPoolBackgroundClose(
          WorkerPoolBackgroundClose(
             WorkerPoolBackgroundClose(
                GenChanNClose(3, func(idx int) int { return idx + 1 }),
                func(i int) string { return strconv.Itoa(i) },
                4),
             func(s string) string { return ">" + s },
             5,
          ),
          func(s string) string { return " |" + s },
          6)