Issue #20189 has been updated by byroot (Jean Boussier).
Expanding string in some encoding (utf16 utf32) can change coderange to either valid or broken,
I must admit I'm not very familiar with wide char encodings, but this surprises me a bit. Ruby strings should always have their terminator, so I don't see how expanding a string would change their interpretation. ---------------------------------------- Bug #20189: `rb_str_resize` does not clear coderange when expanding https://bugs.ruby-lang.org/issues/20189#change-106250 * Author: tompng (tomoya ishida) * Status: Open * Priority: Normal * ruby -v: ruby 3.4.0dev (2024-01-09T07:07:19Z master db476cc71c) [x86_64-linux] * Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED, 3.3: REQUIRED ---------------------------------------- Expanding string in some encoding (utf16 utf32) can change coderange to either valid or broken, but rb_str_resize does not clear coderange. This will cause a bug in c-extension libraries that use rb_str_resize. ~~~ruby # Example for stringio s = StringIO.new("\0".encode('UTF-16LE')) s.truncate(1); s.truncate(2); s.string.valid_encoding? #=> true s.truncate(1); s.string.valid_encoding?; s.truncate(2); s.string.valid_encoding? #=> false (expect to be true) ~~~ -- https://bugs.ruby-lang.org/