The spec and Uniscribe don't allow these, but UTN#11
specifically says the sequence U+104B,U+1038 is valid.
As such, allow all "P V" sequences. There's about
eight sequences that match that structure, but Roozbeh
thinks it's fine to allow all of them.
Test case: U+104B, U+1038
https://bugs.freedesktop.org/show_bug.cgi?id=71947
This is broken sequence according to OpenType spec, Uniscribe,
and current HarfBuzz implementation. But Roozbeh says this
is a valid sequence, so allow it. There are multiple
"(DB As?)?" constructs in the grammar, but Roozbeh thinks only
this one needs changing.
Test case: 1014,1063,103A
Fixes https://bugs.freedesktop.org/show_bug.cgi?id=71949
Behdad Esfahbod