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[plt-scheme] archival docs on arity

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Wed Sep 9 15:51:28 EDT 2009		 
On Sep 9, 2009, at 3:33 PM, Shriram Krishnamurthi wrote:

> I argued for the inclusion of ARITY on the grounds that some other
> Scheme (Chez?) had it -- and I needed it for the first debugging
> support code I wrote.

We could ask Dan or Mitch, but I have the vague memory that even  
Scheme 84 allowed some arity inspection, and that this may have been  
derived from the implementation language (Franz).
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