Use type map to force arrays instead of objects.

Perhaps, an alternative could be to use access properties instead of array
elements?

src/Operation/Count.php

@@ -85,6 +85,7 @@ class Count implements Executable
     public function execute(Server $server)
     {
         $cursor = $server->executeCommand($this->databaseName, $this->createCommand());
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if (empty($result['ok'])) {

src/Operation/CreateCollection.php

@@ -106,6 +106,7 @@ class CreateCollection implements Executable
     public function execute(Server $server)
     {
         $cursor = $server->executeCommand($this->databaseName, $this->createCommand());
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if (empty($result['ok'])) {

src/Operation/Distinct.php

@@ -62,6 +62,7 @@ class Distinct implements Executable
     public function execute(Server $server)
     {
         $cursor = $server->executeCommand($this->databaseName, $this->createCommand());
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if (empty($result['ok'])) {

src/Operation/DropCollection.php

@@ -41,6 +41,7 @@ class DropCollection implements Executable
     public function execute(Server $server)
     {
         $cursor = $server->executeCommand($this->databaseName, new Command(array('drop' => $this->collectionName)));
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if (empty($result['ok'])) {

src/Operation/DropDatabase.php

@@ -39,6 +39,7 @@ class DropDatabase implements Executable
     public function execute(Server $server)
     {
         $cursor = $server->executeCommand($this->databaseName, new Command(array('dropDatabase' => 1)));
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if (empty($result['ok'])) {

src/Operation/FindAndModify.php

@@ -118,6 +118,7 @@ class FindAndModify implements Executable
     public function execute(Server $server)
     {
         $cursor = $server->executeCommand($this->databaseName, $this->createCommand());
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if (empty($result['ok'])) {