ASN.1 has a number of problems with equivalent parsings (very bad in a security context, has been the source of a number of TLS vulnerabilities), as well as the

ASN.1 has a number of problems with equivalent parsings (very bad in a security context, has been the source of a number of TLS vulnerabilities), as well as the fact that even discovering if two ASN.1 parsers will give the same result is undecidable.