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From: Lars Brinkhoff <lars@nocrew.org>
Newsgroups: gmane.emacs.devel
Subject: Re: new `obarray` type
Date: Wed, 15 Mar 2017 19:19:12 +0100
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Stefan Monnier <monnier@iro.umontreal.ca> writes:
> I can recover some of the speed by adding (:type vector) (:named nil)
> to the defstruct definition.

Does that work for you?  It seems to me that (:named nil) does the
opposite of what you would think.