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..06cc653b0969ea82e5077222baeeb7008cb0b58f 100644
--- a/src/arraybuffer.js
+++ b/src/arraybuffer.js
@@ -31,12 +31,12 @@ 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 = ToPositiveInteger(length, 'invalid_array_buffer_length');
+    %ArrayBufferInitialize(this, byteLength);
   } else {
-    return new $ArrayBuffer(byteLength);
+    return new $ArrayBuffer(length);
   }
 }
 
@@ -70,6 +70,9 @@ function ArrayBufferSlice(start, end) {
     fin = MathMin(relativeEnd, this.byteLength);
   }
 
+  if (fin < first) {
+    fin = first;
+  }
   var newLen = fin - first;
   // TODO(dslomov): implement inheritance
   var result = new $ArrayBuffer(newLen);