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From: Eli Zaretskii <eliz@elta.co.il>
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Subject: Re: What does the coding system nil mean?
Date: 26 Jan 2004 19:28:07 +0200
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	(message from Stefan Monnier on Mon, 26 Jan 2004 15:07:48 GMT)
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> Newsgroups: gnu.emacs.help
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 26 Jan 2004 15:07:48 GMT
> 
> For coding-systems, you can use `no-conversion' in place of nil, and there
> was no historical reason to overload the meaning of nil here.

I think the reason was that you say, e.g., "C-x RET t nil" to disable
any conversions to the terminal.