RGlyph getter/setter for skip export

RGlyph_Export.py

from mojo.roboFont import RGlyph

def _setExport(self, export):
    skipExportGlyphs = set(self.font.lib.get("public.skipExportGlyphs", []))
    if export == False:
        skipExportGlyphs.add(self.name)
    elif export == True:
        if self.name in skipExportGlyphs:
            skipExportGlyphs.remove(self.name)
    else:
        raise TypeError("export status must be a boolean, not %s."
                        % type(locked).__name__
                       )
        
    self.font.lib["public.skipExportGlyphs"] = list(sorted(skipExportGlyphs))
    self.font.lib.changed()

def _getExport(self):
    return self.name not in self.font.lib.get("public.skipExportGlyphs", ())

export = property(_getExport, _setExport)
RGlyph.export = export