Minification of code and html string template

js/entity/IntegerEntity.js

@@ -10,9 +10,9 @@ export default class IntegerEntity extends Entity {
         return IntegerEntity.attributes
     }
 
-    constructor(options = { value: 0 }) {
-        options.value = Math.round(options.value)
+    constructor(options = {}) {
         super(options)
+        this.value = Math.round(this.value)
     }
 
     valueOf() {

js/entity/NaturalNumberEntity.js

@@ -0,0 +1,10 @@
+import IntegerEntity from "./IntegerEntity"
+import Utility from "../Utility"
+
+export default class NaturalNumberEntity extends IntegerEntity {
+
+    constructor(options = {}) {
+        super(options)
+        this.value = Math.round(Utility.clamp(this.value, 0))
+    }
+}