Relaxed enum value

js/entity/MirroredEntity.js

@@ -0,0 +1,37 @@
+import IEntity from "./IEntity.js"
+
+/** @typedef {import("./IEntity.js").EntityConstructor} EntityConstructor */
+
+export default class MirroredEntity extends IEntity {
+
+    static attributes = {
+        ...super.attributes,
+        type: {
+            ignored: true,
+        },
+        key: {
+            ignored: true,
+        },
+        object: {
+            ignored: true,
+        },
+    }
+
+    constructor(values = {}) {
+        super({})
+        /** @type {EntityConstructor} */ this.type
+        /** @type {String} */ this.key
+        /** @type {IEntity} */ this.object
+    }
+
+    get() {
+        return this.object?.[this.key]
+    }
+
+
+    set(value) {
+        if (this.object[this.key]) {
+            this.object[this.key] = value
+        }
+    }
+}