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application that saves a copy of itself inside every file it creates, so you can always edit those files later just by executing them
and if you lose the original application, or if it gets automatically updated to a new version that is broken, it doesn't matter -- you still have the exact version of the application that you need to edit the file, perfectly preserved
That’s actually how TiddlyWiki works (it saves itself as an HTML file that includes the app JS plus the data in JSON)
yes, I realized this as I was writing the tweet 
It's called an object. This is why serializing Smalltalk objects works, whereas serializing Java objects does not. Code is part of the data - never separate an instance from its class.
Would you call s-expressions objects too then?
Somewhat related is the PICO8 variant of the PNG file format that carries the game inside the cover picture for the game...
Reminds me of Alan Kay vs Rich Hickey thread https://news.ycombinator.com/item?id=11941656 …
PortableApps, but *really*
you could do this with the Lua interpreter and barely notice, it's like 500k all in
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