In other words, Symbols carrying information inside.
You cannot have Symbol, because you cannot sensibly hide information in there. The only thing would be to build a new domain that encapsulates your data but behaves to the outside world like Symbol (i.e. same category as Symbol has). I fear, however, that Symbol is explicitly needed and not such a boxed domain that I've described.
I'll have to look at it in more detail. But maybe you give a more explicit example of what exactly you want to do. Just do so as if you could box up your things and extract afterwards. I'd like to see a concrete scenario.
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