set-global-staff-size increments

[Christopher Meredith]

I noticed that the values for set-global-staff-size are usually given
in non-whole increments. If I were to use one in between these
suggested increments, will it cause scaling irregularities? In other
words, if 14.14 is too small and 15.87 is too large, can I use
something like 15, or do I have to worry about imprecise proportions?

Thanks!