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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Invalid read syntax for compiled bool vector
Date: Tue, 27 Apr 2004 12:28:54 -0400
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    The print syntax could use octal or hexadecimal escapes in the bit string.

That would be incompatible for some bool-vector values, wouldn't it?
The \ character could appear in a bool-vector with the current syntax.

To avoid misinterpreting some constants, I think we need to change the
syntax in a bigger way, to use a new syntax that would not be valid at
all under the old rules.