Standard Indonesian
Bahasa Indonesia (the formal lingua franca) transcribes accurately — it's a relatively phonetic language with consistent spelling rules. Regional languages (Javanese, Sundanese, Balinese) are separate languages with their own Whisper support, not Indonesian.
Use cases
Indonesian YouTube and podcast content (a huge and rapidly-growing market), Jakarta tech-startup content, university lectures from UI/ITB/UGM, news content. Indonesian is also widely understood across Malaysia and Brunei due to language closeness to Malay.