Various fixes

js/MultiKeyMap.js

@@ -0,0 +1,33 @@
+import Utility from "./Utility"
+
+/**
+ * @template Key
+ * @template Value
+ */
+export default class MultiKeyWeakMap {
+
+    map = new WeakMap()
+
+    constructor() {
+        return new Proxy(this.map, this)
+    }
+
+    /**
+     * @param {WeakMap} target
+     * @param {Key} p
+     * @param {*} receiver
+     * @returns {Value}
+     */
+    get(target, p, receiver) {
+        return Utility.objectGet(target, p)
+    }
+
+    /**
+     * @param {WeakMap} target
+     * @param {Key} p
+     * @param {Value} value
+     */
+    set(target, p, value) {
+        return Utility.objectSet(target, p, value, true, WeakMap)
+    }
+}