It's been about 4 or 5 years since I made this mistake but I've just seen a 
massive swath of code where every access of a dictionary object is using 
valueForKey instead of objectForKey.

I've got a few examples of why this is a "really bad idea"™, and certainly 
might explain why lots of that code is wrapped in try/catch blocks.

Am I correct that using valueForKey will raise an exception if the key is 
missing?

Looking for reasons why I can explain "yeah, I know it works, but here's why 
it's a terrible idea to use to access a dictionary's objects".

Thanks in advance.
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