name contains uppercase letters. get file object error.

With the simplest usage, a single file might be submitted like:
<input type="file" name="userFile" />

Controller code :
$file = $this->request->getFile('userFile');

so. $file is null.

FileCollection file Line 182,
$this->files[$name] = $this->createFileObject($file);

$name not be converted to lowercase.

system/HTTP/Files/FileCollection.php

@@ -85,8 +85,6 @@ class FileCollection
 	{
 		$this->populateFiles();
 
-		$name = strtolower($name);
-
 		if ($this->hasFile($name))
 		{