We're encountering some strange behaviour with the instance? function. The 
first two examples are expected behaviour:

(instance? Double 42.0)
> => true
> (instance? 99 42.0)
> ClassCastException java.lang.Long cannot be cast to java.lang.Class


but the next is not:

(let [Double 99] (instance? Double 42.0))
> => true


We expected that when the symbol Double is bound to a value, then that 
symbol would be evaluated to its value before being passed to a function. 
In this case it seems that the call to instance? is being inlined.

Am I missing something? Is this a bug?

We are using Clojure 1.5.1.

Thanks in advance.

Simon

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