lang: types, engine: graph: Support pointer interfaces

If we have rare, but special *interface{} values in resource structs, we
should be able to handle them normally. It's really not recommended that
you use these unless you know exactly why they are useful.

engine/util/util.go

@@ -193,7 +193,7 @@ func StructFieldCompat(st1 interface{}, key1 string, st2 interface{}, key2 strin
 	}
 
 	// If we're sending _from_ an interface...
-	if kind1 == reflect.Interface {
+	if kind1 == reflect.Interface || kind1 == reflect.Ptr {
 		// TODO: Can we do more checks instead of only returning early?
 		return nil
 	}