fix(serializers): fix for serialization of an empty set or map

[Varixo]

fix #5207, fix #4786

Overview

Fixes serialization of an empty set or map

What is it?

• Feature / enhancement
• Bug
• Docs / tests / types / typos

Use cases and why

  const setData = useComputed$(
    () =>  new Set<string>()
  );

  const mapData = useComputed$(
    () =>  new Map<string, string>()
  );

Checklist:

• My code follows the developer guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• Added new tests to cover the fix / functionality

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🔨 Latest commit	6fb51bb

[Varixo]

I fixed it, however I couldn't find where I should write test cases :/ any tips?

[mhevery]

Thanks for the fix...

Currently, we only have e2e tests for deserialization, but I will be adding unit tests there soon, so. I will cover it.