docs say return type is string or null but ints get returned sometimes 🤷

[julian-CStack]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 4.80%. Comparing base (03d47ae) to head (d14ad05).
⚠️ Report is 6 commits behind head on staging.

Files with missing lines	Patch %	Lines
...vices/exchange/lets_exchange/models/coin_info.dart	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #1441      +/-   ##
===========================================
- Coverage     4.80%    4.80%   -0.01%     
===========================================
  Files         1109     1110       +1     
  Lines       111081   111087       +6     
===========================================
  Hits          5333     5333              
- Misses      105748   105754       +6     

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