Avoiding overwriting of private members redeclared in derived classes

[exeba]

See sebastianbergmann/comparator#83

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.41%. Comparing base (efa4b59) to head (fcc13b2).
Report is 349 commits behind head on main.

❗ Current head fcc13b2 differs from pull request most recent head 10a5d0e. Consider uploading reports for the commit 10a5d0e to get more accurate results

Files	Patch %	Lines
src/Exporter.php	93.75%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #35      +/-   ##
============================================
- Coverage     98.09%   97.41%   -0.69%     
- Complexity       42       46       +4     
============================================
  Files             1        1              
  Lines           105      116      +11     
============================================
+ Hits            103      113      +10     
- Misses            2        3       +1     

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