Handle Set serialization

[RomainLanz]

Hey there! 👋🏻

This PR adds a specific case to serialize a Set to a stringable object.

[thetutlage]

A couple of things.

• If serialization support a data type, then it should be serialized in a consistent manner, regardless of the depth of the data type. That is how other data types are handled too
• The more important one, is to carefully see if there is a common pattern for serializing Set and Map. Because, we are taking on to serialize a language specific data type to JSON (which is not very common). So, we should follow the due diligence and make sure we are inventing our own way of serializing them

[RomainLanz]

I am not sure we should handle Map since they are pretty different and more complex. You can provide anything as a key, meaning a non-keyable object that cannot be adequately serialized.

I have added @targos test to ensure we can serialize nested sets too.

[RomainLanz]

I saw that the ESM rewrite of this package is now using safe-stable-stringify that does not support Set.

Should we close this PR then and expect people to serialize it themself?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.