Discussion: promote any structures from Experimental to Collections?

[jackfoxy]

Description

We are close to releasing FSharpx.Collectons 2.0.

Which (if any) Experimental collections are worthy of promotion to the main Collections library?

Flatlist?

Any one of the 4 RoseTrees? (BinaryRoseTree, EagerRoseTree, IndexedRoseTree, RoseTree)

IntMap? (If so, we need to resolve its test problems #117 )

Others?

[varon]

Would be nice to see FlatList promoted.

[jackfoxy]

@varon I'd be happy to merge a PR that promotes FlatList and its tests.
Adding documentation would be another nice to have #2