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Since cards contain schemas, a piece of data with the contents
notactually"json
can't declare itself to be a JSON document. -
Since links to a card include its GUID, changing the name of a card won't break references to it.
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Since links to a card include its hash, if you want to see what a the contents of a link looked like exactly when it was created, you can.
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Since schemas are just another type of card, you can create new ones on the fly and then have them enforced.
It's actually hard to make a concrete list here since posts can actually be anything. Personally, I find it strange for the main concept in a UI not to map to any kind of concrete data structure, but maybe that's just me.