Tests/feaLib/data/ZeroValue_PairPos_vertical.fea

# For PairPos statements in vertical compilation contexts,
# zero values should get compiled to ValueRecord format 8.
# https://github.com/fonttools/fonttools/issues/633
feature vkrn {
  pos A 0 A 0;
  pos A 0 B <0 0 0 0>;
  pos B <0 0 0 0> A 0;
  pos B <0 0 0 0> B <0 0 0 0>;
} vkrn;