«Unicode is good. If you’re designing a data structure or protocol that has text fields, they should contain #Unicode characters encoded in #UTF8. There’s another question, though: “Which Unicode characters?” The answer is “Not all of them, please exclude some.”

This issue keeps coming up, so [ @paulehoffman and @timbray ] put together an individual-submission draft to the IETF and now (where by “now” I mean “two years later”) it’s been published as #RFC9839. It explains which characters are bad, and why, then offers three plausible less-bad subsets that you might want to use.»

https://www.tbray.org/ongoing/When/202x/2025/08/14/RFC9839 by @timbray

#programming #CharacterEncoding #LML