'in' syntax for searching arrays

[Denton Cockburn]

On Sun, 04 Nov 2007 13:42:41 +0900, Bill Baxter wrote:

> Denton Cockburn wrote:
>> What would be the problem in extending the 'in' syntax used for AA to
>> regular arrays?
>> 
>> I think it's rather nice syntactic sugar.
> 
> What it should mean.  See the series of arguments and counter-arguments 
> in the enh request I filed:
> http://d.puremagic.com/issues/show_bug.cgi?id=1323
> 
> So which meaning where you hoping it would have?
> 
> --bb

search by values, not by index.
I wrote a contains function, and I assume everyone who comes across a
similar use-case does the same.

I just figure it's done often enough that adding it wouldn't be hard,
especially considering the keyword is already there, and with the same
general meaning.