What unicode/non-Latin test cases are covered?

The repository covers extensive Unicode and non-Latin test cases, as shown in [test.js:L106-L145]:

Language Support:

• German umlauts: ä ö ü Ä Ö Ü ß → ae oe ue Ae Oe Ue ss
• Vietnamese: ố Ừ Đ → o U D
• Arabic: ث س و → th s w
• Persian/Farsi: چ ی پ → ch y p
• Urdu: ٹ ڈ ھ → t d h
• Pashto: ګ ړ څ → g r c
• Russian: Ж п ю → Zh p yu
• Romanian: ș Ț → s T
• Turkish: İ ı Ş ş Ç ç Ğ ğ → I i S s C c G g
• Armenian: Ե ր ե ւ ա ն → Ye r ye a n

Additionally, [test.js:L211-L225] tests locale-specific transliteration, such as Swedish (sv) vs. German (de) handling of Räksmörgås producing different results.

The README also mentions the library handles most major languages and references support for German umlauts, Vietnamese, Arabic, Russian, and more.

FOLLOW_UPS:

• How does the transliterate option affect non-Latin characters?
• What are the default customReplacements for special symbols?
• How does locale-specific transliteration work internally?