Man pages matching name zzip_dir_alloc_ext_io in section 3:

zzip_dir_alloc_ext_io.3.en	debian 10 / libzzip-dev
zzip_dir_alloc_ext_io.3.en	debian 11 / libzzip-dev
zzip_dir_alloc_ext_io.3.en	debian 12 / libzzip-dev