Merge pull request #1522 from vkarpov15/patch-3

clone insertMany options before mutating

Author: christkv

lib/collection.js

@@ -496,7 +496,7 @@ define.classMethod('insertOne', {callback: true, promise:true});
 Collection.prototype.insertMany = function(docs, options, callback) {
   var self = this;
   if(typeof options == 'function') callback = options, options = {};
-  options = options || {ordered:true};
+  options = options ? shallowClone(options) : {ordered:true};
   if(!Array.isArray(docs) && typeof callback == 'function') {
     return callback(MongoError.create({message: 'docs parameter must be an array of documents', driver:true }));
   } else if(!Array.isArray(docs)) {