Why VOWELS constant only has one vowel?

[forest-jiang]

In botok/botok/vars.py VOWELS = ["ི"] But it should be four (or five), right? like "ཨེཨིཨུཨོ"

[drupchen]

I found the commit where the other vowels were taken out :

https://github.com/Esukhia/botok/commit/8b47270755732d73bf19a9205907dba67278bf34#

I don't remember if it was intentional or not...