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docs: Add v0.7.4 release notes #2322

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Sep 7, 2023
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docs: Add v0.7.4 release notes #2322

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docs: Add v0.7.4 release notes
matthewfeickert Sep 6, 2023
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matthewfeickert Sep 6, 2023
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1 change: 1 addition & 0 deletions docs/release-notes.rst
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Release Notes
=============

.. include:: release-notes/v0.7.4.rst
.. include:: release-notes/v0.7.3.rst
.. include:: release-notes/v0.7.2.rst
.. include:: release-notes/v0.7.1.rst
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28 changes: 28 additions & 0 deletions docs/release-notes/v0.7.4.rst
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|release v0.7.4|_
=================

This is a patch release from ``v0.7.3`` → ``v0.7.4``.

Fixes
-----

* Skip callbacks with dead weakrefs while iterating over callbacks in ``pyhf``
events, like :func:`pyhf.set_backend`, to avoid the possibility of accessing
dead weakrefs before they could be garbage collected.
(PR :pr:`2310`)

The fixed bug was subtle and occurred nondeterministically when the
:class:`pyhf.tensorlib` was changed repeatedly causing dead weakrefs
to be accessed before Python's garbage collection could remove them.
Most users should be unaffected by this.
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@kratsg let me know if this is clear.


Contributors
------------

``v0.7.4`` benefited from contributions from:

* Daniel Werner
* Jonas Rembser

.. |release v0.7.4| replace:: ``v0.7.4``
.. _`release v0.7.4`: https://github.com/scikit-hep/pyhf/releases/tag/v0.7.4