This is primarily a bugfix release.
= 4.13.4 (20250415)
* If you pass a function as the first argument to a find* method, the
function will only ever be called once per tag, with the Tag object
as the argument. Starting in 4.13.0, there were cases where the
function would be called with a Tag object and then called again
with the name of the tag. [bug=2106435]
* Added a passthrough implementation for NavigableString.__getitem__ which gives a
more helpful exception if the user tries to treat it as a Tag and
access its HTML attributes.
* Fixed a bug that caused an exception when unpickling the result of
parsing certain invalid markup with lxml as the tree builder. [bug=2103126]
* Converted the AUTHORS file to UTF-8 for PEP8 compliance. [bug=2107405]