fix first y-array test

src/Util/RootID.js

@@ -1,9 +1,12 @@
+import { getReference } from './structReferences.js'
+
+export const RootFakeUserID = 0xFFFFFF
 
 export default class RootID {
   constructor (name, typeConstructor) {
-    this.user = -1
+    this.user = RootFakeUserID
     this.name = name
-    this.type = StructManager.getReference(typeConstructor)
+    this.type = getReference(typeConstructor)
   }
   equals (id) {
     return id !== null && id.user === this.user && id.name === this.name && id.type === this.type