Bump to v4.14.0.

isMap.js

@@ -1,8 +1,9 @@
-var getTag = require('./_getTag'),
-    isObjectLike = require('./isObjectLike');
+var baseIsMap = require('./_baseIsMap'),
+    baseUnary = require('./_baseUnary'),
+    nodeUtil = require('./_nodeUtil');
 
-/** `Object#toString` result references. */
-var mapTag = '[object Map]';
+/* Node.js helper references. */
+var nodeIsMap = nodeUtil && nodeUtil.isMap;
 
 /**
  * Checks if `value` is classified as a `Map` object.
@@ -12,8 +13,7 @@ var mapTag = '[object Map]';
  * @since 4.3.0
  * @category Lang
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is correctly classified,
- *  else `false`.
+ * @returns {boolean} Returns `true` if `value` is a map, else `false`.
  * @example
  *
  * _.isMap(new Map);
@@ -22,8 +22,6 @@ var mapTag = '[object Map]';
  * _.isMap(new WeakMap);
  * // => false
  */
-function isMap(value) {
-  return isObjectLike(value) && getTag(value) == mapTag;
-}
+var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
 
 module.exports = isMap;