Bump to v4.0.0.

concat.js

@@ -0,0 +1,30 @@
+define(['./internal/arrayConcat', './internal/baseFlatten', './isArray', './rest'], function(arrayConcat, baseFlatten, isArray, rest) {
+
+  /**
+   * Creates a new array concatenating `array` with any additional arrays
+   * and/or values.
+   *
+   * @static
+   * @memberOf _
+   * @category Array
+   * @param {Array} array The array to concatenate.
+   * @param {...*} [values] The values to concatenate.
+   * @returns {Array} Returns the new concatenated array.
+   * @example
+   *
+   * var array = [1];
+   * var other = _.concat(array, 2, [3], [[4]]);
+   *
+   * console.log(other);
+   * // => [1, 2, 3, [4]]
+   *
+   * console.log(array);
+   * // => [1]
+   */
+  var concat = rest(function(array, values) {
+    values = baseFlatten(values);
+    return arrayConcat(isArray(array) ? array : [Object(array)], values);
+  });
+
+  return concat;
+});