But I cannot know whether I have a pair #lulu -> 3.
For me a dictionary is a set that contains pairs and not only their 
values.
I may be wrong but what I put in a dictionary is not a single value but 
a pair. For me
#lulu -> 5 is not equal to #lulu-> 6. and if I want to know whether a 
dictionary has a
pair or binding I would like to use an includes: message.

> For me, the current includes: makes Dictionary consistent and 
> compatible with
> other collections.  You can know whether an object is included in an 
> Array or
> Dictionary without having to know which one you have.  That each of 
> those
> structures provides a different kind of key-access (integer-index vs.
> object-key) is conveniently irrelevant.






>
> What is includesBinding:?
>
>  - Chris
>