The Google TTS [[https://cloud.google.com/text-to-speech/docs/phonemes|supports]] IPA as input for
- Dutch, English, Filipino, French, German, Hindi, Indonesian, Italian, Korean, Polish, Russian, Spanish, Turkish
but not for
- Afrikaans, Arabic, Basque, Bengali, Bulgarian, Cantonese, Catalan, Czech, Danish, Finnish, Galician, Greek, Gujarati, Hebrew, Hungarian, Icelandic, Japanese, Kannada, Latvian, Lithuanian, Malay, Malayalam, Mandarin, Marathi, Norwegian, Brazilian Portuguese, European Portuguese, Punjabi, Romanian, Serbian, Slovak, Swedish, Tamil, Telugu, Thai, Ukrainian, Vietnamese
Currently specifying one of the latter in `<phonos>` results in `ipa=` being ignored. Officially support them by making `ipa=` optional.
>>! In T320523#8453284, @Samwilson wrote:
> I think we should definitely support whatever the engine supports.