Cloning WeakSet/WeakMap

[Michał Wadas]

Why would they? You can put single object in *infinite* amount of WeakSets
and it won't prevent it's garbage collection.

On 9 Feb 2018 4:11 pm, "Michael Luder-Rosefield" <rosyatrandom at gmail.com>
wrote:

> Possibly a silly question, but...
>
> What happens re garbage collection if you have two WeakSets referencing
> the same object? Do they each block that object's removal?
>
> On Fri, 9 Feb 2018 at 15:05 Michał Wadas <michalwadas at gmail.com> wrote:
>
>> English isn't my native language, so I probably made a mistake.
>>
>> I was asked to add WeakSet.prototype.union(iterable) creating new
>> WeakSet instance including data from both iterable and original WeakSet.
>>
>>
>>
>> On 9 Feb 2018 4:01 pm, "David Bruant" <bruant.d at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> My understanding is that cloning a WeakSet into a Set would remove all
>>> its properties related to security and garbage collection.
>>>
>>> The properties related to security and garbage collection of WeakSet are
>>> based on the fact that its elements are not enumerable by someone who would
>>> only be holding a reference to the WeakSet. If you want to "clone" a
>>> WeakSet into a Set it means you have an expectation that the set of
>>> elements are deterministically enumerable.
>>>
>>> WeakSets and Sets, despite there close name and API, are used in
>>> different circumstances.
>>>
>>> David
>>>
>>>
>>> 2018-02-09 9:53 GMT-05:00 Michał Wadas <michalwadas at gmail.com>:
>>>
>>>> Hi.
>>>>
>>>> I was asked to include a way to clone WeakSet in Set builtins proposal.
>>>> Is there any consensus on security of such operation?
>>>>
>>>> Michał Wadas
>>>>
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