Zeroes display differently before & after decimal point

Using modern theme, ubuntu modern font, but that shouldn't matter necessarily;
Zeroes before decimal point are tall. After the point are fat, as if the lovechild of zeroes and uppercase o's.
Not that I want to start any slanderous rumours.
RStudio_Bug_Zeroes

filed as bug: https://github.com/rstudio/rstudio/issues/5664