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Date: Sun, 25 Jan 2015 20:10:42 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
Subject: Re: [RFC] Set the default locale to en_US.UTF-8
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Cc: arch@FreeBSD.org, Baptiste Daroussin <bapt@FreeBSD.org>,
 Jordan Hubbard <jkh@ixsystems.com>
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On Sun, Jan 25, 2015 at 04:50:12PM +0000, Poul-Henning Kamp wrote:

> --------
> In message <7B1D8345-248B-4C44-9568-079BA29614C2@ixsystems.com>, Jordan Hubbard
>  writes:
> 
> The point about vi(1) is that if you happen to open an ISO-8859 file
> while in UTF-8 mode, change something on the first line, it will
> happily and almost imperceptively truncate your file at the first
> non-UTF byte sequence.
> 
> Needless to say, that is *not* the expected behaviour.

I can't remember other cases, but vi(1) is not exclusion.
Similar cases will be with some like sed/grep.

I think this behaviour must be stopper to _upgrade_ locale on existing
installations.

System software (from FreeBSD base) not exclusive for this behaviour
(dangerous dependens from current locale). This is may be third-party
sofware or software writen by customer. Unexpected setting locale to
UTF-8 may be broken this software.

For new install setting locale to UTF-8 will be ok.