I am doing this course:

https://www.edx.org/xseries/how-code-systematic-program-design

It uses the Basic Student Language and they use DrRacket, which is fine. Still, 
I happen to also use other editors, like vim and emacs. With emacs, I use 
racket-mode and I am able to run tests with check-expect and things work fine.

Still, I have not been able to figure out how to make the repl print numbers 
with repeating decimal instead of fractions.

If I create a file in DrRacket itself and set the language to Basic Student 
Language, I can check "Details" in the "Choose Language" dialog and choose 
between fractions and repeating decimal. The resulting file then contains 
something like this:

#reader(lib "htdp-beginner-reader.ss" "lang")((modname area-tests) 
(read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor 
repeating-decimal #f #t none #f () #f)))

My question is: why doesn't it work if I have that line on top of .rkt files 
and run the code from racket-mode (which invokes racket behind the scenes and 
opens the repl) or from the command line with `racket file.rkt`‽

In short, how can I get repeating decimals when I am not using DrRacket?

Thanks in advance for any help or insights.

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