[6cxs2hd6]

> So, I think a better naming would have been...

Often I like to use past participles as names for stream or signal combinators.

So instead of `map`, `filter`, `fold` -- the names are `mapped`, `filter`, `folded`.

For example, given a stream, `(mapped stream f)` returns a new stream with f mapped over it. It returns a mapped stream.