Update typed arrays behavior to match ES6 rev 15. Remove TO_POSITIVE_INTEGER and throw on negative …

src/arraybuffer.js

Index: src/arraybuffer.js
diff --git a/src/arraybuffer.js b/src/arraybuffer.js
index 2b0c3dd85b1107bc2f5a98d355a24ad7a974e9fe..1ad470079d64b0e8faa4af0790c82beacaaeb235 100644
--- a/src/arraybuffer.js
+++ b/src/arraybuffer.js
@@ -31,12 +31,14 @@ var $ArrayBuffer = global.ArrayBuffer;
 
 // -------------------------------------------------------------------
 
-function ArrayBufferConstructor(byteLength) { // length = 1
+function ArrayBufferConstructor(length) { // length = 1
   if (%_IsConstructCall()) {
-    var l = TO_POSITIVE_INTEGER(byteLength);
-    %ArrayBufferInitialize(this, l);
+    var byteLength = IS_UNDEFINED(length) ? 0 : TO_INTEGER(length);

[rossberg, 2013/06/24 12:36:03]

Doesn't TO_INTEGER(undefined) yield 0 anyway?

+    if (byteLength < 0)
+      throw MakeRangeError("invalid_array_buffer_length");
+    %ArrayBufferInitialize(this, byteLength);
   } else {
-    return new $ArrayBuffer(byteLength);
+    return new $ArrayBuffer(length);
   }
 }