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> There's a standard way to attach metadata to tables, and it's to put them
> in metatables. Add a meta-field for whatever information you need, write
> predicates isarray() / ishash() which abstract implementation details
> away, and you're done.

Hmm, I guess we could do that and allow the user to pass those methods
to the libraries. It is a bit convoluted but LuaJSON does that:

Thank you for the suggestion. I hope library authors will follow it now :)

Pierre Chapuis