Bump to v4.1.0.

_replaceHolders.js

@@ -0,0 +1,28 @@
+/** 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;
+}
+
+module.exports = replaceHolders;