After having a silly runtime error of a missing argument, I wondered why arity 
wasn't checked (on hash-ref in my case).

Looking through old thread started by Roman Klochkov, I saw the answer to his 
and my identical question on arity checks.  I changed my logging to show in Dr 
Racket and included warnings on the list.  My immediate problem is solved.

My suggestion is that having a default of showing GC collection but not showing 
probable arity errors is misplaced.  For me, the GC information is noise.  
However, the arity check is very pertinent.  I understand that I can change the 
setting and I have.  However, I suspect that a review of those defaults would 
better assist the audience that is unlikely to have modified defaults.

Thanks for a wonderful environment.
John Griffin

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