Simple serialization entities fixes and tests

js/entity/Integer64Entity.js

@@ -17,16 +17,18 @@ export default class Integer64Entity extends IEntity {
         return Parsernostrum.numberBigInteger.map(v => new this(v))
     }
 
-    /** @param {BigInt | Number} value */
-    constructor(value = 0) {
-        if (value.constructor !== Object) {
-            value = {
-                // @ts-expect-error
-                value: value,
+    /** @param {BigInt | Number | Object} values */
+    constructor(values = 0) {
+        if (values.constructor !== Object) {
+            values = {
+                value: values,
             }
         }
-        super(value)
-        /** @type {BigInt | Number} */ this.value
+        if (values.value === -0) {
+            values.value = 0n
+        }
+        super(values)
+        /** @type {BigInt} */ this.value
     }
 
     valueOf() {