In the MAN entry for " --openpgp ": "Reset all packet, cipher and digest options to OpenPGP behavior. [...] All PGP workarounds are also disabled." What PGP workarounds are there, other than the explicit rfc1991, compress-algo, etc., user options? That is, is the command " gpg --no-options " somehow different from " gpg --no-options --openpgp "?