Bump to v4.0.0.

toPlainObject.js

@@ -0,0 +1,31 @@
+import copyObject from './internal/copyObject';
+import keysIn from './keysIn';
+
+/**
+ * Converts `value` to a plain object flattening inherited enumerable
+ * properties of `value` to own properties of the plain object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {Object} Returns the converted plain object.
+ * @example
+ *
+ * function Foo() {
+ *   this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.assign({ 'a': 1 }, new Foo);
+ * // => { 'a': 1, 'b': 2 }
+ *
+ * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
+ * // => { 'a': 1, 'b': 2, 'c': 3 }
+ */
+function toPlainObject(value) {
+  return copyObject(value, keysIn(value));
+}
+
+export default toPlainObject;