Bump to v4.1.0.

_replaceHolders.js

@@ -0,0 +1,31 @@
+define([], function() {
+
+  /** Used as the internal argument placeholder. */
+  var PLACEHOLDER = '__lodash_placeholder__';
+
+  /**
+   * Replaces all `placeholder` elements in `array` with an internal placeholder
+   * and returns an array of their indexes.
+   *
+   * @private
+   * @param {Array} array The array to modify.
+   * @param {*} placeholder The placeholder to replace.
+   * @returns {Array} Returns the new array of placeholder indexes.
+   */
+  function replaceHolders(array, placeholder) {
+    var index = -1,
+        length = array.length,
+        resIndex = -1,
+        result = [];
+
+    while (++index < length) {
+      if (array[index] === placeholder) {
+        array[index] = PLACEHOLDER;
+        result[++resIndex] = index;
+      }
+    }
+    return result;
+  }
+
+  return replaceHolders;
+});