From ab5b529dd2acf1a6183ab6bd859d4b2992fcd1b6 Mon Sep 17 00:00:00 2001
From: Tom Gallacher <tomgallacher23@gmail.com>
Date: Tue, 24 Nov 2015 21:48:03 +0000
Subject: [PATCH] buffer: default to UTF8 in byteLength()

If an undefined encoding is passed to byteLength(),
assume that it is UTF8 immediately. This yields a
small speedup, as it prevents string operations on
the encoding argument.

PR-URL: https://github.com/nodejs/node/pull/4010
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
---
 lib/buffer.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/buffer.js b/lib/buffer.js
index 210fdf4f058ff2..dff740e1b2b363 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -272,6 +272,7 @@ function byteLength(string, encoding) {
 
       case 'utf8':
       case 'utf-8':
+      case undefined:
         return binding.byteLengthUtf8(string);
 
       case 'ucs2':