[BUG][typescript-fetch] Set is not converted to Array when "typeMappings": { "Set": "Array"} is provided

[nikosanctioned]

Bug Report Checklist

• [ ] Have you provided a full/minimal spec to reproduce the issue?
• [ ] Have you validated the input using an OpenAPI validator (example)?
• [ ] Have you tested with the latest master to confirm the issue still exists?
• [ ] Have you searched for related issues/PRs?
• [ ] What's the actual output vs expected output?
• [ ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

I have get the error: TypeError names?.find is not a function at runtime page.bundle.js:6 A non-serializable value was detected in the state, in the path: model.modelInfo.names. Value: Set(2) {{…}, {…}}

openapi-generator version

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Run generator => run the app part that relates to using uniqueItems: true names property

Related issues/PRs

Suggest a fix