There often appears to be a small to sizeable difference in the total number of kerning pairs present within a source Glyphs file vs an exported OTF re-opened in Glyphs. In a typical Glyphs file the Kerning Window shows total kern pairs hitting around 4000–5000 pairs. If we open an OTF in Glyphs this number tends to increase by anything from 100 – 800 pairs.
I’m assuming that there is some de-compossing/re-writing of the kern table info upon Export. Or that the Kern Table is interpreted differently on OTF Import. I’m just curious if there was any more info on this?