Has any programming language defined a data-definition subset which is truly lossless and truly a subset? Something like JSON is to Java, but with rigor. The forward compatibility problem is more subtle than it seems, e.g. as Eric Lippert describes:https://ericlippert.com/2009/05/11/reserved-and-contextual-keywords/ …
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That's where the existing languages I know of fall short. They might support a binary format with that guarantee, but not a literal syntax. Common Lisp comes closest with its
#n= and #n# reader syntax but it has the aforementioned limitations, but it'd be easy to support. -
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