[Doc] Structural sharing

[ShalokShalom]

The documentation lacks currently any notion about structural sharing

Does any of the data types support that?

Or do they simply copy real data around behind the scenes?

[dbrattli]

Hey, the data structures are agnostic to the data you add. Thus, even if the structure may be immutable, the Py-objects may or may not be immutable. What is the need and behavior you are looking for?

[ShalokShalom]

I am asking if the implementation uses structural sharing.

That means, if they are really copied, or using something like an 'Hash Array Mapped Trie'

[dbrattli]

The Map implementation in particular is a more or less direct port of F# Map to Python: https://github.com/fsharp/fsharp/blob/master/src/fsharp/FSharp.Core/map.fs

[ShalokShalom]

And the others?