RE: Thoughts on upsizing Unicode (was: Re: Are there [start] emoji [end] style codes?)

Doug Ewell via Unicode <[email protected]> Tue, 31 Mar 2026 04:15:25 +0000
Newsgroups gmane.text.unicode.general
Message-ID <SA5PR03MB8401A52755862437DE52A5CCCA53A@SA5PR03MB8401.namprd03.prod.outlook.com>
I wrote:

> High and low surrogates carry 10 bits of payload each, so I’m curious
> where the 31st bit in a triple comes from.

I see it now:

> In addition to the current HS/LS (high surrogate/low surrogate) pairs,
> allow triples: HS/HS/LS and HS/LS/LS.

HS/HS/LS gives you 2³⁰ code points, and HS/LS/LS gives you another 2³⁰, for a total of 2³¹.

Of course, there would be two different ways to encode U+0000 through U+FFFF (one 16-bit code unit or three), and two different ways to encode U+10000 through U+10FFFF (two code units or three), so some invalid sequences would need to be defined, similar to those in UTF-8.

--
Doug Ewell, CC, ALB | Lakewood, CO, US | ewellic.org