Handle some TODOs

[bep]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.91489% with 17 lines in your changes missing coverage. Please review.

Project coverage is 79.78%. Comparing base (f3324d1) to head (03cb980).

Files	Patch %	Lines
metadecoder_exif.go	78.26%	5 Missing ⚠️
metadecoder_iptc.go	84.37%	3 Missing and 2 partials ⚠️
io.go	69.23%	4 Missing ⚠️
imagedecoder_png.go	72.72%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   80.48%   79.78%   -0.70%     
==========================================
  Files          14       14              
  Lines        1199     1222      +23     
==========================================
+ Hits          965      975      +10     
- Misses        161      172      +11     
- Partials       73       75       +2     

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