static folly::Optional<ClassInfo> commonAncestor(ClassInfo a,
ClassInfo b) {
if (!isNormalClass(a.get()) || !isNormalClass(b.get())) return folly::none;
if (auto result = a.get()->commonAncestor(b.get())) {
return ClassInfo(result, ClassTag::Sub);
}
return folly::none;
}
static bool subtypeOf(ClassInfo a, ClassInfo b) {
return a.get()->classof(b.get());
}
