From 71650cafeb26ace6e31a96f493259ab380aa896b Mon Sep 17 00:00:00 2001
From: Sam Thorogood <sam.thorogood@gmail.com>
Date: Fri, 6 Mar 2020 14:46:31 +1100
Subject: [PATCH] don't clone buffer if we don't need to

---
 text.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/text.js b/text.js
index 1b7dc59..5ba1053 100644
--- a/text.js
+++ b/text.js
@@ -141,6 +141,13 @@ FastTextDecoder.prototype.decode = function(buffer, options={stream: false}) {
     throw new Error(`Failed to decode: the 'stream' option is unsupported.`);
   }
 
+  // Look for ArrayBufferView, which isn't a real type, but basically represents
+  // all the valid TypedArray types plus DataView. They all have ".buffer" as
+  // an instance of ArrayBuffer.
+  if (buffer.buffer instanceof ArrayBuffer) {
+    buffer = buffer.buffer;
+  }
+
   const bytes = new Uint8Array(buffer);
   let pos = 0;
   const len = bytes.length;