avoid copy filecontainer

[mathause]

c.f. #126 😉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (78c20cc) to head (0c0ed50).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   99.67%   99.67%   -0.01%     
==========================================
  Files           5        5              
  Lines         310      308       -2     
==========================================
- Hits          309      307       -2     
  Misses          1        1              

Flag	Coverage Δ
unittests	99.67% <100.00%> (-0.01%)	⬇️

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