Round coordinates on Variable font

I’m working on a variable font with very thin strokes, using decimal coordinates. When exporting it as a variable font, the result is different.
— Does Glyphs round coordinates when exporting as a var TT file?
— On 20148 or 1000 units?
I would like the exported font to be as accurate as possible.
Thanks a lot,

Yes. Decimal coordinates are not possible in TT.

The UPM is whatever you set it to in Font Info.

Thanks Rainer!
I’ll round coordinates then.