From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@horizon.com
Subject: Re: [PATCH] git-blame: Make the output human readable
Date: 8 Mar 2006 14:06:00 -0500
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> So that mk_wcwidth() must be used unconditionally, and not as a
> fallback for systems which do not provide wcwidth() in libc.

Ah, the light dawns!  I now understand your confusion.
That was exactly the idea; apologies for being unclear.

Kind of like the existing issspace(), isdigit(), isalpha(), etc.
implementations in git-compat-util.h to avoid the mysteries and vagaries
of locales.  A UTF-8-only solution is desired.