Structured clones

Anne van Kesteren annevk at
Wed Sep 4 13:18:47 PDT 2013

On Thu, Apr 11, 2013 at 11:19 AM, Anne van Kesteren <annevk at> wrote:
> On Wed, Apr 10, 2013 at 3:27 PM, Mark S. Miller <erights at> wrote:
>> For those new to these lists,
>> <>
>> may provide some context. The structured clone algorithm has changed since
>> then. But looking this over, I think most of these points are still
>> relevant. See also the rest of the thread starting at this message.
> With regards to #4 in that message, Blob/File/FileList are readonly,
> so there is no writing to the same object.
> Given that workers and indexed DB depend on this feature it is not
> going away. We could rebrand it as marshalling as suggested in that
> thread I suppose, but I was mostly interested if this was something we
> should be able to express in JavaScript as well.
> There's also a concept of transferable objects for objects to which
> you can write, such as ArrayBuffer.

This has come up again:

This concept will keep growing and is used by multiple APIs these
days. I don't really have any concrete proposals, but it seems like
something we should solve at the language level and not monkey patch
on top of it. It's probably late again as with ArrayBuffer to design
something from the ground up, but maybe there's still salvageable


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