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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Overlay mechanic improvements
Date: Sat, 20 Sep 2014 18:56:21 +0300
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> Date: Sat, 20 Sep 2014 09:19:02 -0400
> From: Richard Stallman <rms@gnu.org>
> Cc: vekazanov@gmail.com, emacs-devel@gnu.org
> 
> The existing data structure is fine for overlays used as they are intended
> to be used.

The existing data structure doesn't scale well.  What Stefan suggest
will scale better, while preserving all the features and properties of
overlays as we have them today.