Should FlatMap unwrap inputs?

[rohanpm]

Let's say that you have a function which returns a future, and sometimes you want to call it directly, other times you want to chain it with some subsequent flat_map.

Currently, with_flat_map does not unwrap incoming futures to the map function. Should it?

Without this feature, for this scenario it's necessary to insert some extra with_flat_map just to unwrap futures produced by an earlier step, e.g.

  Executors.sync().\
    bind(some_async_fn). \
    with_flat_map(lambda f: f). \
    with_flat_map(do_something_async_with_result)

[rohanpm]

I think there should be flat_bind(x) which has the same meaning as bind(x).with_flat_map(lambda f: f).