I just had trouble with the type of log; I wanted to pass it a positive real, 
and get back a Real.  After inspecting the type, I see that it works for 
Positive-Float.  Is this deliberate, in order to get more optimizable code (if 
the input is a float, we don't need to check it), or just an oversight?  If the 
former, it seems like there should be some easier way to deliver this 
information to the user.

John

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