Levente you should realize that these methods have been defined and used
more than a couple of years ago. 
They are used by a cool group of programmer and the infrastructure of Moose 
since
also a couple of years so I would not call them useless misleading 
but thanks for you analysis :)

It is time to rewrite them. 
But flatCollect: and flatCollectAsSet: names are more important than their 
implementation. 

>> I just checked these and most of them are useless misleading or duplicate, 
>> like:
> 
> Collection >>
> #collectAsSet: -> #collect:as: (ok, it's new in pharo)
> #equalsTo:
>   misleading name, #containsSameElementsAs: would be better IMO
>   #(1 1 2) equalsTo: #(2 1 1) ===> true

Yes I do not really like it 

> #flatCollect: -> #gather:

the problem is that gather: does not convey its intention.
flatCollect: is much much better. 

> #flatCollectAsSet: -> #gather: + #asSet

Is it not faster?

> #flatten --
>   misleading name, since it doesn't change the object, but returns
>   a new array and it's only flattening one level which is what #gather:
>   does. Tthere's a proper #flattened implementation in squeak treated
>   inbox if you're interested. (guess why it's not in the trunk)
> #groupBy: -> #groupBy:having:
> #sum: -> #detectSum:
> 
> Symbol >>
> #value (same as super)
> 
> SequenceableCollection >>
> #shuffle -> #shuffled
> 
> OrderedCollection >>
> #removeAtIndex: -> #removeAt:
> 
> (-> means that the extension on the left is the same as or worse than
> the already existing method(s) on the right)
> 
> I guess you should shrink this package. :)
> 
> 
> Levente_______________________________________________
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