[gfody]

> I wonder what the best way is to handle this disparity for international software. It seems like either you punish the Latin alphabets, or the others.

there are over a million codepoints in unicode, thousands for latin and other language agnostic symbols emojis etc. utf-8 is designed to be backwards compatible with ascii, not to efficiently encode all of unicode. utf-16 is the reasonably efficient compromise for native unicode applications hence it being the internal format of strings in C# and sql server and such.

the folks bleating about utf-8 being the best choice make the same mistake as the "utf-8 everywhere manifesto" guys: stats skewed by a web/american-centric bias - sure utf-8 is more efficient when your text is 99% markup and generally devoid of non-latin scripts, that's not my database and probably not most peoples

[exceptione]

  > sure utf-8 is more efficient when your text is 99% markup and generally devoid of non-latin scripts, that's not my database and probably not most peoples

I think this website audience begs to differ. But if you develop for S.Asia, I can see the pendulum swings to utf-16. But even then you have to account for this:

  «UTF-16 is often claimed to be more space-efficient than UTF-8 for East Asian languages, since it uses two bytes for characters that take 3 bytes in UTF-8. Since real text contains many spaces, numbers, punctuation, markup (for e.g. web pages), and control characters, which take only one byte in UTF-8, this is only true for artificially constructed dense blocks of text. A more serious claim can be made for Devanagari and Bengali, which use multi-letter words and all the letters take 3 bytes in UTF-8 and only 2 in UTF-16.»¹

In the same vein, with reference to³:

  «The code points U+0800–U+FFFF take 3 bytes in UTF-8 but only 2 in UTF-16. This led to the idea that text in Chinese and other languages would take more space in UTF-8. However, text is only larger if there are more of these code points than 1-byte ASCII code points, and this rarely happens in real-world documents due to spaces, newlines, digits, punctuation, English words, and markup.»²

The .net ecosystem isn't happy with utf-16 being the default, but it is there in .net and Windows for historical reasons.

  «Microsoft has stated that "UTF-16 [..] is a unique burden that Windows places on code that targets multiple platforms"»¹

___

1. https://en.wikipedia.org/wiki/UTF-16#Efficiency

2. https://en.wikipedia.org/wiki/UTF-8#Comparison_to_UTF-16

3. https://kitugenz.com/

[gfody]

the talk page behind the utf-16 wiki is actually quite interesting. it seems the manifesto guys tried to push their agenda there, and the allusions to "real text" with missing citations are a remnant of that. obv there's no such thing as "real text" and the statements about it containing many spaces and punctuation are nonsense (many languages do not delimit words with spaces, plenty of text is not mostly markup, and so on..)

despite the frothing hoard of web developers desperate to consider utf-16 harmful, it's still a fact that the consortium optimized unicode for 16-bits (https://www.unicode.org/notes/tn12) and their initial guidance to use utf-8 for compatibility and portability (like on the web) and utf-16 for efficiency and processing (like in a database, or in memory) is still sound.

[exceptione]

Interesting link! It shows its age though (22 years), as it makes the point that utf-16 is already the "most dominant processing format", but if that would be the deciding factor, then utf-8 would be today's recommendation, as utf-8 is the default for online data exchange and storage nowadays, all my software assumes utf-8 as the default as well. But I can't speak for people living and trading in places like S.Asia, like you.

If one develops for clients requiring a varying set of textual scripts, one could sidestep an ideological discussion and just make an educated guess about the ratio of utf-8 vs utf-16 penalties. That should not be complicated; sometimes utf-8 would require one more byte than utf-16 would, sometimes it's the other way around.