[racket] How to get arity of make-object?

 For any procedure I can use procedure-arity. But how to get the number of init arguments for a class?

Or maybe there are any other way to make a contract, like in Guide 7.3.9, where one can compare number of arguments and arity of the function, but when using (make-object someclass ...)
instead of the function.


-- 
Roman Klochkov
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