v7.5.4

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• If you attempt to combine statement coverage data with branch coverage data,
  coverage.py used to fail with the message "Can't combine arc data with line
  data" or its reverse, "Can't combine line data with arc data." These
  messages used internal terminology, making it hard for people to understand
  the problem. They are now changed to mention "branch coverage data" and
  "statement coverage data."

• Fixed a minor branch coverage problem with wildcard match/case cases using
  names or guard clauses.

• Started testing on 3.13 free-threading (nogil) builds of Python. I'm not
  claiming full support yet. Closes issue 1799_.

.. _issue 1799:https://github.com/nedbat/coveragepy/issues/17999

.. _changes_7-5-3:

v7.5.3

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• Performance improvements for combining data files, especially when measuring
  line coverage. A few different quadratic behaviors were eliminated. In one
  extreme case of combining 700+ data files, the time dropped from more than
  three hours to seven minutes. Thanks for Kraken Tech for funding the fix.

• Performance improvements for generating HTML reports, with a side benefit of
  reducing memory use, closing issue 1791_. Thanks to Daniel Diniz for
  helping to diagnose the problem.

.. _issue 1791:https://github.com/nedbat/coveragepy/issues/17911

.. _changes_7-5-2:

v7.5.2

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• Fix: nested matches of exclude patterns could exclude too much code, as
  reported in issue 1779_. This is now fixed.

• Changed: previously, coverage.py would consider a module docstring to be an
  executable statement if it appeared after line 1 in the file, but not
  executable if it was the first line. Now module docstrings are never counted
  as executable statements. This can change coverage.py's count of the number
  of statements in a file, which can slightly change the coverage percentage
  reported.

• In the HTML report, the filter term and "hide covered" checkbox settings are
  remembered between viewings, thanks to Daniel Diniz <pull 1776_>_.

• Python 3.13.0b1 is supported.

• Fix: parsing error handling is improved to ensure bizarre source files are
  handled gracefully, and to unblock oss-fuzz fuzzing, thanks to Liam DeVoe <pull 1788_>. Closes issue 1787.

.. _pull 1776:https://github.com/nedbat/coveragepy/pull/17766
.. _issue 1779https://github.com/nedbat/coveragepy/issues/177979
.. _issue 178https://github.com/nedbat/coveragepy/issues/1787787
.. _pull 17https://github.com/nedbat/coveragepy/pull/17881788

.. _changes_7-5-1: