Is a set a sequence?

[gwendal.roue (Gwendal Roué)]

@cherrywoods

As I tried to point out, Iteration does not really require (persistent) ordering. If you need to do order dependant operations on a set, in my opinion you should itterate and copy it to an array, even if it is slow, because you can (should) not assume for a Set what is assumable for an ordered collection.

The answer to this good question:

@Ben_Cohen

The only thing you can rely on with a Set is that multiple passes over a Set will return the values in the same order on each pass (assuming no mutation is happening in-between).

(see the rest of that topic for more interesting guarantees)