* [varLib] Always write tuple entries for composite glyphs Fixes https://github.com/fonttools/fonttools/issues/1381 Fixes https://github.com/googlei18n/fontmake/issues/481 partially * Make sure at least one gvar delta is written for composites * Add test data for composite fix * Put in the correct issue link * Typo * Fix typos * Expand comment, add link to issue * Add ttx files for test font