feat(api): warn about mismatched attributes

[favonia]

Close #840. Close #912.

[codecov]

Codecov Report

Attention: Patch coverage is 99.53052% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.67%. Comparing base (086ed61) to head (9847e49).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/ddns/ddns.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #921      +/-   ##
==========================================
+ Coverage   95.58%   95.67%   +0.08%     
==========================================
  Files          58       58              
  Lines        2583     2635      +52     
==========================================
+ Hits         2469     2521      +52     
  Misses        104      104              
  Partials       10       10              

Flag	Coverage Δ
unittests	95.67% <99.53%> (+0.08%)	⬆️

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