Do icons for export as SVG, need to be created on a pixel grid? [migrated]

I am creating an icon font, using https://icomoon.io/

It works like this: create icons as vector. Export as SVGs. Load into icomoon. Export as code.

Now, last time I did this was 2.5yrs ago. I can't recall if my original set of icons in Illustrator, need to be round pixel values (no decimals)?

I know if I want to export icons as PNGs, and supply to dev to hard code, icons need to be whole pixel values.

Thank you kindly for your help.