The underlying formalpdf lib throws up this warning if an XFA PDF is run.
init_forms() called on XFA pdf, but this pdfium binary was compiled without XFA support.
Run `PDFIUM_PLATFORM=auto-v8 pip install -v pypdfium2 --no-binary pypdfium2` to get a build with XFA support.
The underlying
formalpdflib throws up this warning if an XFA PDF is run.