fix: missing/incorrect key when rendering self referential objects

[shaswat-indian]

This PR fixes the issue when the key was either missing (when rootName=false) or the key was rendered as "root" if it wasn't set.

For example, for the given object:-

const value: any = {
  text: 'Hello World'
}
value.self = value;

Before (with rootName=false)

After (with rootName=false)

Before (with default rootName)

After (with default rootName)

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[shaswat-indian]

@pionxzh Could I get a review on this, please?

[pionxzh]

LGTM. Thanks 🙏

[pionxzh]

Released