Bump to v4.10.0.

_castSlice.js

@@ -0,0 +1,22 @@
+define(['./_baseSlice'], function(baseSlice) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Casts `array` to a slice if it's needed.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {number} start The start position.
+   * @param {number} [end=array.length] The end position.
+   * @returns {Array} Returns the cast slice.
+   */
+  function castSlice(array, start, end) {
+    var length = array.length;
+    end = end === undefined ? length : end;
+    return (!start && end >= length) ? array : baseSlice(array, start, end);
+  }
+
+  return castSlice;
+});