I really hope en-IN moves to American spellings and gets rid of the lakh/crore numbers and use million/billion instead (more scientific). Then it basically becomes en-CA with nice things like ₹.
Million/billion is more familiar to non-Indians, but I don't understand how that system's more scientific.
Also, from your lack of milliard, I'm guessing you're advocating for the short scale:
[1] https://en.wikipedia.org/wiki/International_System_of_Units