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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Janitorial issues: Man-getpage-in-background
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    (a) (let ((process-environment (copy-sequence process-environment)))
	  (setenv "FOO" "bar")
	  ...)

    (b) (let ((process-environment (cons "FOO=bar" process-environment)))
	  ...)

    It looks really strange to see them both in the same function...

    Okay to unify?  (I'd choose (a) unless there are objections.)

Ok.