fix: fix slm image data repr and eq

[tlambert03]

closes #208

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.97%. Comparing base (3628eed) to head (91d7d5e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
- Coverage   94.09%   93.97%   -0.12%     
==========================================
  Files          22       22              
  Lines        1473     1477       +4     
==========================================
+ Hits         1386     1388       +2     
- Misses         87       89       +2     

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