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From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.ada
Subject: Re: Exclusive file access
Date: Fri, 11 Sep 2015 18:54:54 +0200
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Date: 2015-09-11T18:54:54+02:00
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* Dmitry A. Kazakov:

> On Mon, 07 Sep 2015 20:27:58 +0200, Florian Weimer wrote:
>
>> * Dmitry A. Kazakov:
>> 
>>> Anything you can encode in Unicode you can encode in Unicode.
>> 
>> This is simply not true across multiple Unicode versions (and when
>> dealing with multi-byte encodings).
>
> Versions of Unicode are irrelevant.

Not true.

>> It is not possible to express all
>> possible UCS-2 sequences in UTF-32, in the sense that converting from
>> UTF-32 completely covers the entire set of UCS-2 strings.
>
> You can represent all code ranges in UTF-32. I don't think the language
> should care about "visible characters." This insanity can be safely
> ignored.

Not true.  Please read the specification and the restrictions on the
surrogate range.