That OrderedSet is not really a set, just a thin wrapper over 
OrderedCollection, so performance will be surprisingly bad.
Squeak has OrderedDictionary which has all the methods a Set needs:
#at: anObject put: nil <=> #add: anObject
#includesKey: anObject <=> #includes:anObject
#keysDo: aBlock <=> #do: aBlock
#removeKey: anObject <=> #remove: anObject

Note that removal will take O(size) time. If you need anything better, you 
have to implement your own set (e.g. a linked hash set. Squeak's LRUCache 
has a list implementation that can come handy).

Levente

On Tue, 27 Nov 2018, David T. Lewis wrote:

> Thanks Benoit,
>
> The repository is http://www.squeaksource.com/PharoTaskForces, the package
> is OrderedSet, and the latest version is OrderedSet-StephaneDucasse.2.mcz
>
> Dave
>
> On Wed, Nov 28, 2018 at 01:06:49AM +0000, Benoit St-Jean via Squeak-dev wrote:
>> Your link doesn't work either.
>> Go to ProjectsType OrderedSet in the search box.Only one result will come up (as PharoTaskForces)!If you click on that and browse the versions, you'll see the OrderedSet packages!
>> 
>> ----------------- 
>> Beno??t St-Jean 
>> Yahoo! Messenger: bstjean 
>> Twitter: @BenLeChialeux 
>> Pinterest: benoitstjean 
>> Instagram: Chef_Benito
>> IRC: lamneth 
>> Blogue: endormitoire.wordpress.com 
>> "A standpoint is an intellectual horizon of radius zero".?? (A. Einstein) 
>>
>>     On Tuesday, November 27, 2018, 7:58:38 p.m. EST, David T. Lewis <lewis at mail.msen.com> wrote:
>>
>>  That link does not work, but there is an OrderedDictionary project on
>> at http://www.squeaksource.com/TFOrderedDictionary.html. It that it?
>> 
>> 
>> On Wed, Nov 28, 2018 at 12:08:06AM +0000, Benoit St-Jean via Squeak-dev wrote:
>> > There's that on SqueakSource.
>> > http://squeaksource.com/@Ilyu71XtQNt-3Xwp/UMBrp13p
>> > ----------------- 
>> > Beno??t St-Jean 
>> > Yahoo! Messenger: bstjean 
>> > Twitter: @BenLeChialeux 
>> > Pinterest: benoitstjean 
>> > Instagram: Chef_Benito
>> > IRC: lamneth 
>> > Blogue: endormitoire.wordpress.com 
>> > "A standpoint is an intellectual horizon of radius zero".?? (A. Einstein) 
>> > 
>> >?? ?? On Tuesday, November 27, 2018, 5:18:51 p.m. EST, Bernhard Pieber <bernhard at pieber.com> wrote:?? 
>> >?? 
>> >?? Hi Squeakers,
>> > 
>> > Does anyone know of an OrderedSet implementation for Squeak somewhere?
>> > 
>> > Bernhard
>> > 
>> >?? 
>> > 
>>
>> 
>>