Different digits for different columns

[shoonlee]

Hi! Thanks always for the great package.

I'm curious if it'd be possible to feed a vector (e.g., c(0,0,0,2)) as an argument for "digits". As far as I understand, we can choose only 1 number of digits for all the columns, but oftentimes (especially when we use different dependent variables for different columns) it could be useful to use different numbers of digits.

Thank you!