This error doesn’t happen if you just install the package (or at least doesn’t for me)

It seems to be some problem when run in the pkg-build context, but I don’t know why

I would like to know some details about how racket stores structs and other data types (data layout, headers, boxing, ref-counts, etc). Could someone point me to some literature or towards the right place in the source ?

This is a good starting point: https://help.luddy.indiana.edu/techreports/TRNNN.cgi?trnum=TR400

Thank you! Does racket implement these or are they part of chez and racket piggybacks on that implementation?

The latter: part of Chez

The Racket BC implementation is different

so the layout of racket SC struct is the same as chez struct

nice

Are you interested in representation for Scheme in general - or only Racket?

racket specifically