Fix: magic serializer issue

[deependujha]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #178

PR review

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[deependujha]

Sorry, didn't even tested in rush. Some tests based on file serializer are failing. Fixing them quickly.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@6ebb7b9). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             main   #207   +/-   ##
=====================================
  Coverage        ?    77%           
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  Files           ?     33           
  Lines           ?   4669           
  Branches        ?      0           
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  Hits            ?   3585           
  Misses          ?   1084           
  Partials        ?      0           

[tchaton]

Awesome work !