Glyphs 3 requires version 3 file format for RTL kerning

I’d like to work with Glyph 3 even though I’m using version 2 file format (still waiting for glyphsLib to catch on), and I just found out that RTL kerning require version 3 file format which is a rather significant limitation.

All things that can’t be properly round tripped can’t be stored in version 2 files. The support for Glyphs 3 file in glyphsLib is almost there. Simon had implemented it. You might be able to help by testing his branch.

I see, thanks.

There is a mekkablue script in the Kerning submenu for importing RTL kerning from G2 to G3. And, with losses (so I recommend it only for emergencies), from G3 back to G2.