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Mon Oct 10 18:22:42 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-October/146638.html

> On Tue, Oct 11, 2016 at 4:03 AM, Paul Moore <p.f.moore at gmail.com> wrote:
> 
>> If you have an object that forever owns a reference to
>> another object, it's safe to return borrowed references.

Even if there are such cases, it seems we're going to
have to be a lot more careful about identifying them.

It might be safer not to have any APIs that return
borrowed references, or at least name them in a way
that make it clear they're dangerous and only to be
used with extreme care.

Having things like PyDict_GetItem where the *normal*
version of the API returns a borrowed reference seems
like a footgun.

-- 
Greg

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[Python-Dev] PyWeakref_GetObject() borrows its reference from... whom?