I don’t think I’ve ever needed it on a non-sequential collection. And the semantics would not be obvious on e.g. a dictionary. 

So I don't really see the point of moving it up.

Vanessa

On Sat, Jun 10, 2023 at 08:10 <christoph.thiede@student.hpi.uni-potsdam.de> wrote:
Hi all,

I was just wondering why we only define #withoutDuplicates on SequenceableCollection, since it does not depend on the order of the receiver and could be applied to other types of collections as well. For instance, Set could override it with ^self copy, Bags would be naturally covered as well, etc.

What do you think?

Best,
Christoph

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