hasKey?

[Kevin A. Burton]

It seems to make sense to add a hasKey method.

For a lot of operations I just want to do quick existence checks and get 
back a boolean yes or no.   We're doing a LARGE amount of queries and 
doing a get() and getting back the data just doesn't make sense.

Also... if the objects you are storing are large it also make sense even 
if you're not doing to many of them.

I realize that memcached is fast but for a lot of situations this could 
offload the network and the CPU on the client.

Kevin

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