After looking into this further, it appears that I need to modify
the implementation of the Book C++ class to include a
print_smob() method if I want to see its contents.
Kim
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In my ongoing exploration of lilypond internals, i am looking
at printing out the value of the argument being passed to
toplevel-book-handler, defined in ly/declarations-init.ly.
I have tried a few different functions such as
(display-scheme-music book port)
or
(pretty-print book port)
