[racket] Destructors in Racket

 I have a structure, that has a filestream inside it. File have to be cosed, when the structure is not used anymore (so gargbage collected).

Is the best way to do
(require ffi/unsafe)
(register-finalizer my-obj
   (lambda (x) (close-output-port (obj-file x))))

?

It seems doing right thing, but why `ffi/unsafe'? Is it OK, when my program actually doesn't use FFI?


-- 
Roman Klochkov
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