Nan values in Tabulator NumberEditor

I have created a table for editing using the panel.widgets.Tabulator

I have a nullable float type column that i would like to be able to edit in this table. how do i do that? I would like it to be so that if i just delete everything in the cell and press enter that it would default to nan. Right now it defaults to 0.0. I can see that the NumberFormatter has a nan_format property. is there something similar for the Number editor? in case not is it something that would be hard to implement as a custom editor in an easy way?