[JackyHsu-X]

apply_pages(method="single") passes initfn_kwargs to the page callback instead of pagefn_kwargs. This can raise an unexpected-keyword error when an initializer has its own arguments, and it makes top-level get_text() silently ignore options such as option="dict", clip, and sort=True.

Pass the documented pagefn_kwargs, matching the multiprocessing path. Add real-PDF regressions for separate initializer/callback arguments and for extraction options in both single-process and multiprocessing modes, including non-contiguous page selection.

Found through source inspection and reproduced locally. This is separate from the completed page-selection fix #4524 and the fork-page-index change in open #5076.

Validation on Windows / Python 3.13.15:

• New cases against original production code: 8 failed, 4 passed (the four multiprocessing controls pass).
• Complete tests/test_textextract.py: 37 passed with the fix.
• Official Pylint and Flake8 test functions passed; changed-file compilation and diff checks passed.

The checkout's Python sources were tested using the native bindings from the official PyMuPDF 2.0 wheel (MuPDF 1.28.5). Native extensions were not rebuilt; the full repository suite and other platforms were not run.

AI assistance: OpenAI Codex investigated the defect, prepared the patch and regression tests, ran the checks, and self-reviewed the diff. No separate human code review is claimed.

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[JackyHsu-X]

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