Entities cleanup, Primitive concept introduced

js/entity/primitive/Integer.js

@@ -0,0 +1,25 @@
+import Primitive from "./Primitive"
+
+export default class Integer extends Primitive {
+
+    constructor(value) {
+        super()
+        // Using constructor equality and not instanceof in order to consider both primitives and objects
+        if (value?.constructor === String) {
+            value = Number(value)
+        }
+        if (value?.constructor === Number) {
+            value = Math.round(value)
+        }
+        /** @type {number} */
+        this.value = value
+    }
+
+    valueOf() {
+        this.value
+    }
+
+    toString() {
+        return this.value.toString()
+    }
+}