Improve file handling

[gerlero]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.36842% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.57%. Comparing base (4f19b78) to head (36787a9).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
foamlib/_files/_io.py	95.00%	1 Missing ⚠️
foamlib/_files/_parsing.py	97.05%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   88.56%   88.57%           
=======================================
  Files          16       16           
  Lines        1242     1260   +18     
=======================================
+ Hits         1100     1116   +16     
- Misses        142      144    +2     

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