What unicode/non-Latin test cases are covered?

The repository has comprehensive test coverage for non-Latin characters across multiple languages. Here are the covered test cases [test.js:L106-L145]:

German umlauts:

• ä ö ü Ä Ö Ü ß → transliterates to ae oe ue Ae Oe Ue ss

Vietnamese:

• ố Ừ Đ → transliterates to o U D

Arabic:

• ث س و → transliterates to th s w

Persian / Farsi:

• چ ی پ → transliterates to ch y p

Urdu:

• ٹ ڈ ھ → transliterates to t d h

Pashto:

• ګ ړ څ → transliterates to g r c

Russian:

• Ж п ю → transliterates to Zh p yu

Romanian:

• ș Ț → transliterates to s T

Turkish:

• İ ı Ş ş Ç ç Ğ ğ → transliterates to I i S s C c G g

Additionally, the tests verify behavior with the transliterate: false option [test.js:L246-L258], where non-ASCII characters are preserved instead:

• Déjà Vu → déjà-vu (preserved)
• Räksmörgås → räksmörgås (preserved)
• 你好世界 (Chinese) → preserved as-is
• مرحبا (Arabic) → preserved as-is

The README also mentions locale-specific transliteration [test.js:L211-L227], with Swedish and German locales producing different outputs for the same input.

FOLLOW_UPS:

• How does the transliterate option affect performance?
• What's the difference between locale-specific transliteration results?
• Which languages are supported by the transliterate dependency?