Another fallover from merging of VariationMerger and InstancerMerger. New code is closer to the selfless merger we want to have. Fixes https://github.com/fonttools/fonttools/issues/834
Another fallover from merging of VariationMerger and InstancerMerger. New code is closer to the selfless merger we want to have. Fixes https://github.com/fonttools/fonttools/issues/834