Fix param serialization bug

[lsbardel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.34%. Comparing base (ee95ec2) to head (ae6052b).

Files with missing lines	Patch %	Lines
fluid/utils/data.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   95.29%   95.34%   +0.05%     
==========================================
  Files          43       43              
  Lines        2909     2941      +32     
==========================================
+ Hits         2772     2804      +32     
  Misses        137      137              

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