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From: Eli Zaretskii <eliz@is.elta.co.il>
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Subject: Re: decode-coding-string and consing
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On Mon, 10 Feb 2003, Jesper Harder wrote:

> >> Under what conditions is the decoding operation "trivial"?
> >
> > If CODING-SYSTEM is nil or such that no encoding is necessary at all.
> 
> But I don't understand why any encoding is needed at all in:
> 
>     (decode-coding-string "abc" 'us-ascii t)

Why did you use us-ascii at all here?  It's not really a coding system.
Why not nil or raw-text?

Anyway, is there some real problem behind this discussion?