fix: check if inlined map implements unmarshaler

[tdakkota]

No description provided.

[codecov]

Codecov Report

Base: 76.66% // Head: 76.66% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (fe7d12c) compared to base (a443d26).
Patch coverage: 92.85% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   76.66%   76.66%   -0.01%     
==========================================
  Files          22       22              
  Lines        7239     7243       +4     
==========================================
+ Hits         5550     5553       +3     
- Misses       1318     1319       +1     
  Partials      371      371              

Impacted Files	Coverage Δ
yaml.go	87.12% <90.00%> (+2.27%)	⬆️
decode.go	85.58% <100.00%> (-0.45%)	⬇️

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