and everything is interoperable.
That it will be interoperable is something that must be committed to, unambiguously -- it is not something #lang implementors get for free.
(Based-on-a-true-story example of bad interoperability... Your Racket module naturally uses lists, the Racket language is then changed to make lists immutable (and let's say it gets a new #lang for that), your old module #lang still works, but now you can only use new modules in the new #lang with difficulty and bug-prone-ness, and then an old third-party package you use is moved to the new #lang, so you are stuck on an old version of that or have to modify your code, or give up and rework all your code in the new #lang. There are ways that could've been avoided, but it didn't come for free, and didn't happen.)
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