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From: Jason Rumney <jasonrumney@gmail.com>
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Subject: Re: those funny non-ASCII characters
Date: Thu, 31 May 2012 21:23:24 -0700 (PDT)
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On Thursday, 31 May 2012 01:15:11 UTC+8, Buchs, Kevin  wrote:

> Xah suggested I embrace Unicode. So I could use (prefer-coding-system
> 'utf-8) or the file variable: -*- coding: utf-8 -*-. Are there drawbacks
> to the former? What about opening an ASCII coded file? Can emacs
> properly detect it or does it come up as UTF-8?

ASCII is a subset of UTF-8, so the problem you are imagining does not exist.