fix: enum JSONType#serializer not work #2269

[Milkdove]

What this PR does / why we need it?

fix #2269

Summary of your change

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.39%. Comparing base (27ca2b4) to head (76c00ab).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2285   +/-   ##
=========================================
  Coverage     77.39%   77.39%           
- Complexity    22689    22690    +1     
=========================================
  Files           634      634           
  Lines         84980    84981    +1     
  Branches      19283    19283           
=========================================
+ Hits          65773    65775    +2     
- Misses        11216    11218    +2     
+ Partials       7991     7988    -3     

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