Fix epsilon adjustment for fuzzy set boundaries

[iosurodri]

Adjust epsilon handling for fuzzy set calculations.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.34%. Comparing base (4571401) to head (0583589).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   37.34%   37.34%           
=======================================
  Files          33       33           
  Lines        6861     6861           
=======================================
  Hits         2562     2562           
  Misses       4299     4299           

Flag	Coverage Δ
unittests	37.34% <100.00%> (ø)

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