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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Overlay insertion types, markers, etc.
Date: Wed, 20 Nov 2019 19:33:20 +0200
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> From: Richard Stallman <rms@gnu.org>
> Cc: eliz@gnu.org, emacs-devel@gnu.org
> Date: Wed, 20 Nov 2019 11:17:04 -0500
> 
>   > 1. Why, if you pass markers [to `make-overlay],
>   >    isn't the default to use the insertion types of
>   >    those markers?
> 
> I don't think I ever thought about the question back then.
> 
> Did pointers even have insertion types, back when overlays were first
> introduced?

No.  insertion-type of markers was added in Emacs 19.30, and overlays
were added before that.