Problem/Motivation When enabling CORS support in Drupal, cacheability is broken because this header is added to every request (of a different origin, but that is a different bug, see: [#3001809]): Vary: Origin This breaks cacheability because if a site allows numerous other origins to make requests to their site, they will get a cached version for each origin. Some CDNs will not cache the request at all if this is present as it results in too many cache objects. Proposed resolution This problem has been resolved upstream in asm89/stack-cors#64.

Currently the character я is replaced by a not by ya as expected. See [#357254] as a reference for correct transliteration table.

Problem/Motivation Ukrainian letters are not transliterated properly. In most cases, they're using russian transliteration rules, which is not correct. For example, "И" is transliterated as I (must be Y). Steps to reproduce Transliterate Ukrainian pangram via \Drupal::transliteration()->transliterate('text is here', 'uk'); Source: На подушечці форми любої є й ґудзик щоб пірʼя геть жовте сховати. Current result: Na podushechci formi lyuboi e y gudzik schob pir'ya get zhovte skhovati.