Question about Perl5 extended UTF-8 design

Karl Williamson public at
Fri Nov 6 22:50:04 CST 2015

On 11/06/2015 01:32 PM, Richard Wordingham wrote:
> On Thu, 05 Nov 2015 13:41:42 -0700
> "Doug Ewell" <doug at> wrote:
>> Richard Wordingham wrote:
>>> No-one's claiming it is for a Unicode Transformation Format (UTF).
>> Then they ought not to call it "UTF-8" or "extended" or "modified"
>> UTF-8, or anything of the sort, even if the bit-shifting algorithm is
>> based on UTF-8.
>> "UTF-8 encoding form" is defined as a mapping of Unicode scalar values
>> -- not arbitrary integers -- onto byte sequences. [D92]
> If it extends the mapping of Unicode scalar values *into* byte
> sequences, then it's an extension.  A non-trivial extension of a
> mapping of scalar values has to have a larger domain.
> I'm assuming that 'UTF-8' and 'UTF' are not registered trademarks.
> Richard.

I have no idea how my original message ended up being marked to send to 
this list.  I'm sorry.  It was meant to be a personal message for 
someone who I believe was involved in the original design.

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