FSharp.Control.AsyncSeq is a collection of asynchronous programming utilities for F#.

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Contributions are warmly welcomed! To get started, fork the repository and create a branch from main. Keep pull requests small and focused on a single concern, and make sure all existing tests pass before submitting (dotnet test). For bug reports, please include a minimal reproduction. For significant new features or breaking changes, consider opening an issue first to discuss the approach with the maintainers. All contributors are expected to follow the F# Software Foundation Code of Conduct.

As of v4.0, AsyncSeq<'T> is a type alias for System.Collections.Generic.IAsyncEnumerable<'T> (the BCL type). This means:

• AsyncSeq<'T> values are directly usable anywhere IAsyncEnumerable<'T> is expected (e.g. await foreach in C#, IAsyncEnumerable<T> APIs).
• IAsyncEnumerable<'T> values (from EF Core, ASP.NET Core streaming endpoints, etc.) can be used directly wherever AsyncSeq<'T> is expected — no conversion needed.
• The AsyncSeq.ofAsyncEnum and AsyncSeq.toAsyncEnum helpers are now no-ops and have been marked [<Obsolete>]. Remove any calls to them.

If you called .GetEnumerator() / .MoveNext() directly on an AsyncSeq<'T>, update to .GetAsyncEnumerator(ct) / .MoveNextAsync() (the IAsyncEnumerator<'T> BCL contract). All other AsyncSeq module combinators are unchanged.

• @dsyme
• @martinmoec
• @xperiandri
• @abelbraaksma

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