Address corner case bugs in the check access and get file size helpers in `fileio.py`#379

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jonasbardino wants to merge 2 commits intonextfrom

fix/issue-378-corner-case-bugs-in-fileio-module

Commits on Nov 1, 2025

Address a few corner case bugs in the check access and get file size helpers of
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Address a couple of old unrelated pylint `used-before-assignment` warnings.
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