Collection lacks ordering as concept.
SequenceableCollections are immutable.
OrderedCollection is first one that is mutable and allows adding/ 
removing elements.

-Todd Blanchard

On Jan 17, 2007, at 2:16 AM, Edgar J. De Cleene wrote:

> Why removeLast and removeFirst is implemented into OrderedCollection ?
> It's not wiser have it into Collection so this way is more useful ?
>
> Edgar
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