Serialize arguments objects

lib/values.js

@@ -117,7 +117,13 @@ module.exports = {
 		const proto = Object.getPrototypeOf(val);
 		if (isFunction(val)) return this.serializeFunction(val, proto, record);
 		if (proto === null) return this.serializeNullPrototypeObject(val);
-		if (proto === Object.prototype) return this.serializeProperties(val);
+		if (proto === Object.prototype) {
+			// `arguments` objects have proto of `Object.prototype` but are not plain objects
+			if (Object.prototype.toString.call(val) === '[object Arguments]') {
+				return this.serializeArgumentsObject(val);
+			}
+			return this.serializeProperties(val);
+		}
 		if (proto === Array.prototype) return this.serializeArray(val);
 		if (proto === RegExp.prototype) return this.serializeRegex(val);
 		if (proto === Date.prototype) return this.serializeDate(val);
@@ -147,6 +153,47 @@ module.exports = {
 			: serializePropertyKey(key);
 	},
 
+	serializeArgumentsObject(args) {
+		// Get/create record for `createArgumentsObject` function
+		let createArgsRecord = this.getRecord(createArgumentsObject);
+		if (!createArgsRecord) {
+			createArgsRecord = Object.create(null);
+			createArgsRecord.path = '';
+			createArgsRecord.parent = null;
+			createArgsRecord.packageDepth = 0;
+			createArgsRecord.pathDepth = 0;
+			createArgsRecord.keyDepth = 0;
+			createArgsRecord.js = 'function() { return arguments; }';
+			this.records.set(createArgumentsObject, createArgsRecord);
+		}
+
+		// Serialize args
+		const propJss = [],
+			dependencies = [];
+		let len = 0;
+		for (const key of Object.getOwnPropertyNames(args)) {
+			if (key !== '0' && !key.match(/^[1-9]\d*$/)) continue;
+
+			const val = args[key];
+			if (!isPrimitive(val)) dependencies.push(val);
+			propJss.push(this.serializeValue(val));
+			len++;
+		}
+
+		// Serialize as call to `createArgumentsObject(arg1, arg2, ...)`
+		const js = `${valuePlaceholder(createArgsRecord.id)}(${propJss.join(', ')})`;
+		dependencies.push(createArgumentsObject);
+
+		return this.wrapWithProps(
+			args, js, dependencies,
+			key => (
+				(key === 'length' && args.length === len)
+				|| key === 'callee'
+				|| key === '0' || key.match(/^[1-9]\d*$/)
+			)
+		);
+	},
+
 	serializeArray(arr) {
 		const dependencies = [];
 		let previousEmpty = true;
@@ -249,3 +296,5 @@ module.exports = {
 		return {js: `${assignJs}(${targetJs}, ${propsJs})`, dependencies};
 	}
 };
+
+function createArgumentsObject() {}