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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: print-circle and describe-variable
Date: Mon, 09 Apr 2007 22:21:07 -0400
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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    Try (let ((print-circle t) (toto (list 2))) (prin1 (list toto toto)))

    In some cases, this is a good feature, but in many other cases it can be
    very confusing.

That is a good point.  So I guess it is better not to make this change.

How about binding print-length and print-level instead?
They could be bound to eval-expression-print-length, etc.