fix(sync): ensure extras are preserved

[noirbizarre]

Extras are currently removed on sync.

This PR fixes it, they are now preserved and normalized (aka. sorted alphabetically).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.32%. Comparing base (fb8c286) to head (aca7357).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files           9        9           
  Lines         572      572           
  Branches      105      105           
=======================================
  Hits          551      551           
  Misses         18       18           
  Partials        3        3           

Flag	Coverage Δ
unittests	96.15% <100.00%> (ø)

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[GabDug]

Thanks @noirbizarre!