[plt-scheme] archival docs on arity

From: Ben Goetter (goetter at mazama.net)
Date: Wed Sep 9 20:07:40 EDT 2009

Matthias Felleisen 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).
As another datapoint, T (mid 1980s) had arity inspection, which it 

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