Can _any_ object be wrapped as a reactive variable?

I wonder if any object can be set to a reactive variable. Are there any objects that should not be? For example, are some objects too large for that, or incompatible with the structure of reactive variables? What are the best practices?

Yes, any object can be, especially with meta programming.
However, if they do not need any interaction with the user, then it's just extra (though minor) code, memory, and mental costs.

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