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From: Richard Stallman <rms@gnu.org>
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Subject: Re: 64-bit lossage
Date: Sun, 4 Aug 2002 17:24:42 -0600 (MDT)
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    To represent Elisp integers that do not fit in 28 bits, we could use
    floating point.

That is a possible approach for many kinds of data, that are used in
only a few places in the C code, but it would not be feasible to do
this for buffer indices.  There are lots many places in the code that
convert buffer position from Lisp integers and C ints and back.