Rename default() to __default__()

[Schamper]

Fixes #107

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.46%. Comparing base (b5ce35d) to head (fde09e4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   92.46%   92.46%           
=======================================
  Files          20       20           
  Lines        2176     2176           
=======================================
  Hits         2012     2012           
  Misses        164      164           

Flag	Coverage Δ
unittests	92.46% <100.00%> (ø)

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