AsyncSeq.scan behaves differently from Seq.scan (doesn't emit initial state)

[eulerfx]

Not sure if it should, but issue shown in:

FSharp.Control.AsyncSeq/tests/FSharp.Control.AsyncSeq.Tests/AsyncSeqTests.fs

Line 152 in e092247

let expected = ls |> Seq.scan f z |> Seq.skip 1 |> AsyncSeq.ofSeq

[dsyme]

Agreed these should be consistent. Can someone take this and submit a PR?

[eulerfx]

I'll do it.

[eulerfx]

Fixed with 8c6cebe