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From: Richard Stallman <rms@gnu.org>
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Subject: Re: environment variable don't get coding conversion
Date: Mon, 20 Jan 2003 11:46:05 -0500
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    As far as I know, any coding system set in locale-coding-system is
    stateless.  None of them uses escape sequences.  So, decoding and
    encoding should yield the same value.

If this is true, it would be safe, but is it really an issue
we need to worry about?

    > It might be better for user programs to decode the values
    > if they want to.

    User programs?  Then, what to do with M-x setenv?

For the mean time, maybe nothing needs to be done.