Numbers display strangely in the font used for titles in the new site theme.
Numbers 3, 4, 5, 7 and 9 hang below the string horizontal gravity center. Examples here.
Numbers 0, 1 and 2 are shrunken. Examples here.
Most of these are minor, cosmetic issues. But when it comes to the number zero, it's a problem. The number zero looks like the letter 'o'.
For example, I saw this question and thought, "Why does this person want to store a letter in a raster cell? Rasters only store numbers, do they not understand how rasters work? ...Wait, can you store a letter in a raster?" > Down the rabbit hole searching for "storing letters in rasters." Did not get around to answering the question.