feat(mergewith): mergewith now receive variadic parameters

[samber]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.88%. Comparing base (68c8fe6) to head (de19191).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   67.90%   67.88%   -0.03%     
==========================================
  Files          76       76              
  Lines        8351     8355       +4     
==========================================
+ Hits         5671     5672       +1     
- Misses       2595     2598       +3     
  Partials       85       85              

Flag	Coverage Δ
unittests	67.88% <100.00%> (-0.03%)	⬇️

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