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* Update tox.ini for newer file format and new Python versions * Update GitHub Actions workflow to use newer Python versions * Update GitHub Actions versions * Specify GitHub actions Python versions as strings
* Fix race condition causing intermittent gzip corruption The _process_chunk method checked _last_chunk to determine whether to use Z_FINISH, but _last_chunk wasn't set until after the read thread submitted the final chunk. This caused the last chunk to sometimes be compressed with Z_SYNC_FLUSH instead of Z_FINISH, producing invalid gzip files with unterminated deflate streams (00 00 FF FF marker). Fix by peeking ahead in _read_file to determine is_last before submitting to the pool, and passing the flag directly to _process_chunk. * Update tests to reflect passing in is_last to _process_chunk --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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