[whatwg] Serialization of expandos on String / Boolean / Number objects

• From: Dumez, Christophe <christophe.dumez@intel.com>
• Date: Thu, 23 Aug 2012 22:13:28 +0300
• To: whatwg@lists.whatwg.org
• Message-ID: <CAKeX+ok89i19BANajS591gG_ntYukiLjs-7iEo2WXJ8V6zuadw@mail.gmail.com>

Hi,

The latest specification of the structured clone algorithm [1] does
not indicate that we are supposed to serialize expandos on objects
such as String, Boolean or Number.

For example:
var str = new String("test");
str.foo = 3;
window.postMessage(str, "*");

Isn't str.foo property supposed to be serialized? If I read the
specification correctly, it is not:
"""
If input is a String object

         Let output be a newly constructed String object with the same
value as input.
"""

Is this behavior really intended? I think it would make sense to
serialize the properties attached to such objects.

[1] http://www.whatwg.org/specs/web-apps/current-work/#safe-passing-of-structured-data

Kr,
--
Christophe Dumez
Linux Software Engineer, PhD
Intel Finland Oy - Open Source Technology Center

Received on Thursday, 23 August 2012 19:14:09 UTC