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See <https://bugs.ruby-lang.org/issues/19417#note-3>. https://unicode.org/reports/tr18/#word states word should match join_control chars. It did not previously: ```ruby [*0x0..0xD799, *0xE000..0x10FFFF].map { |n| n.chr 'utf-8' } => all_chars all_chars.grep(/\p{join_control}/) => jc jc.count # => 2 jc.grep(/\p{word}/).count # => 0 ``` [Backport #19417] --- Backporting note: I regenerated `enc/unicode/15.0.0/name2ctype.h` using `make update-unicode`.