I'm not sure if this changed. To get a #t with equal? you can add
#:transparent . But be careful because #:transparent is more powerful
than what I expected. For example, it makes available the constructor
of the struct.

#lang racket

(define-struct foo (a b))
(make-foo 3 4)               ; ==> #<foo>
(equal? (make-foo 3 4)
        (make-foo 3 4))      ; ==> #f

(define-struct foo/tr (a b) #:transparent)
(make-foo/tr 3 4)            ; ==> #<foo>
(equal? (make-foo/tr 3 4)
        (make-foo/tr 3 4))   ; ==> #t


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