Slipcover

This release simply re-issues v1.0.9: GitHub lacks Python 3.8 for `macos-latest`, causing the build and upload workflow to partially fail.

This release fixes a bug instrumenting certain bytecodes on Python 3.11.
Thanks to LilyFoote for the bug report (including narrowing the problem down).

This release fixes none of the wheels on PyPI tagged as appropriate for Python 3.13.

This release:

- adds support for Python 3.13 (tested on 3.13.0a6; may not work on earlier versions);
- improves `pytest-fork` detection;

Thanks to adiroiban for the early work on Python 3.13 support;

This release:
- improves performance handling subprocesses (Unix only);
- fixes a bug reporting subprocess data merge errors if tests close stderr;
- fixes a bug not passing the script name as a string in sys.argv[0] when executing a script directly;
- fixes a bug attempting to print coverage when none was collected;

This release adds `--merge`, which merges JSON coverage files, as in:


slipcover --merge a.json b.json --out c.json


Closes 12.