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Re: arity failures

Thomas Bushnell BSG wrote:

Also, "failing" an arity check doesn't mean that you will get any kind
of error or exception as a result.

[...]

So, to recap:

Being told that a procedure takes, say, exactly three arguments, does
not mean that
  1) You won't get an error for passing three arguments;
  2) You will get an error for passing other than three arguments.
I'm confused -- the intent of the proposal is if you apply a procedure to a number of arguments it is reported not to accept, you will get an error. Why is this not the case? 

David