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From: Richard Stallman <rms@gnu.org>
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Subject: Re: (elisp)Object Internals
Date: Sat, 20 Dec 2003 12:18:58 -0500
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    >     Depending on the operating system and type of machine for which
    >     you compile Emacs, twenty-nine bits are used to address the
    >     object, and the remaining three bits are used for a GC mark bit and
    >     the tag that identifies the object's type.
    > 
    > Is this accurate?

    I think so.  

    But I don't know if there are systems where this doesn't apply.

It is only meant to describe the most common systems, not all
systems.