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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Line wrap reconsidered
Date: Tue, 26 May 2020 18:00:15 +0300
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To: Yuan Fu <casouri@gmail.com>
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> From: Yuan Fu <casouri@gmail.com>
> Date: Mon, 25 May 2020 23:30:36 -0400
> Cc: emacs-devel <emacs-devel@gnu.org>
> 
> I had a look at category table. IIUC, a category table for all unicode characters would be impractically large and unnecessary.

That conclusion is mistaken.  Emacs char-tables are designed to handle
memory very efficiently.  In particular, if just a small number of
characters have a non-nil property value, the memory consumption of
such a char-table will be very low, and will grow and shrink as needed
if additional values are modified from or to nil.