Bump to v3.7.0.

internal/baseMap.js

@@ -1,4 +1,6 @@
 import baseEach from './baseEach';
+import getLength from './getLength';
+import isLength from './isLength';
 
 /**
  * The base implementation of `_.map` without support for callback shorthands
@@ -10,9 +12,12 @@ import baseEach from './baseEach';
  * @returns {Array} Returns the new mapped array.
  */
 function baseMap(collection, iteratee) {
-  var result = [];
+  var index = -1,
+      length = getLength(collection),
+      result = isLength(length) ? Array(length) : [];
+
   baseEach(collection, function(value, key, collection) {
-    result.push(iteratee(value, key, collection));
+    result[++index] = iteratee(value, key, collection);
   });
   return result;
 }