fix: Serialisation of float values

[mark-koch]

Fixes #218

[qartik]

This seems to work with get_custom_value()

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.57%. Comparing base (7ad3908) to head (9833df5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #219   +/-   ##
=======================================
  Coverage   90.56%   90.57%           
=======================================
  Files          43       43           
  Lines        4622     4624    +2     
=======================================
+ Hits         4186     4188    +2     
  Misses        436      436           

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