qpdf --add-attachment test.typ -- test.pdf new.pdf
attaches a typst source to make the PDF so it can be modified. Kinda like LibreOffice Hybrid PDF.
qpdf --list-attachments new.pdf
test.typ -> 78,0
then just compile a new PDF once you modify the test.typ
typst c test.typ --open
extract attachment by opening PDF with Firefox / Librewolf and clicking on attachment icon then clicking on typst file to save it to harddisk.
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