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get nargs for a function

From: Sam Halliday
Subject: get nargs for a function
Date: Fri, 28 Aug 2015 09:55:16 -0700 (PDT)
User-agent: G2/1.0

Hi all,

Is there a built in way to return the arg list (actually just the number of 
args) for a function that has been passed to me?

If I was just in dynamic scope, I could get cadr and count the size, but I have 
to support closure as well which is caddr (and however that changes in the 

Best regards,

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