support asyncSeq or IAsyncEnumerator

[dmitry-a-morozov]

http://tomasp.net/blog/async-sequences.aspx/
or
http://github.com/Reactive-Extensions/Rx.NET/blob/master/Ix.NET/Source/System.Interactive.Async/IAsyncEnumerator.cs

[panesofglass]

I vote for AsyncSeq because the pattern follows that of FSharpList. IAsyncEnumerator has all the problems of IEnumerator, including thrown exceptions and mutable state.

[dsyme]

It would make sense to have AsyncSeq in a single nuget package/project, so other projects could start to take dependencies on it. It may also be a candidate for FSharp.Core, though the bar is much higher there (e.g. w.r.t. perf).

[panesofglass]

@dsyme 👍

Actually, I think now that a lot of F#x should be broken into smaller assemblies. My original thought was to do this with sources that could just compile into your project as many are small enough and could then be tweaked to individual preferences. The downside, of course, is that it becomes much more difficult to upgrade reliably.

[dmitry-a-morozov]

I agree - would be nice to have AsyncSeq as separate nuget package/project