Benchmarking two different approaches to IAsyncEnumerable.Switch

BenchmarkAsyncSwitch.cs

[MemoryDiagnoser]
public class SwitchWithNonBlockingSources
{
    public readonly static IAsyncEnumerable<IAsyncEnumerable<int>> source = AsyncEnumerable
        .Range(0, 1000)
        .Select(i => AsyncEnumerable.Range(0, 1000));

    [Benchmark]
    public async ValueTask<int> IterativeSingleLogicalThread()
    {
        return await source.Switch().LastAsync();
    }

    [Benchmark]
    public async ValueTask<int> ConcurrentLogicalThreads()
    {
        return await source.Switch2().LastAsync();
    }
}