Add ArrayOf::pop()
diff --git a/src/hb-open-type.hh b/src/hb-open-type.hh
index 511b8ae..c9e8307 100644
--- a/src/hb-open-type.hh
+++ b/src/hb-open-type.hh
@@ -572,6 +572,8 @@
 
   explicit operator bool () const { return len; }
 
+  void pop () { len--; }
+
   hb_array_t<      Type> as_array ()       { return hb_array (arrayZ, len); }
   hb_array_t<const Type> as_array () const { return hb_array (arrayZ, len); }