@type t() ::
  integer()
  | :COMMON_EXTENSION_NAME_UNSPECIFIED
  | :COMMON_EXTENSION_NAME_BASIC_CONSTRAINTS
  | :COMMON_EXTENSION_NAME_KEY_USAGE
  | :COMMON_EXTENSION_NAME_EXTENDED_KEY_USAGE
  | :COMMON_EXTENSION_NAME_SUBJECT_ALTERNATIVE_NAME
  | :COMMON_EXTENSION_NAME_AUTHORITY_KEY_IDENTIFIER
  | :COMMON_EXTENSION_NAME_SUBJECT_KEY_IDENTIFIER
  | :COMMON_EXTENSION_NAME_AUTHORITY_INFORMATION_ACCESS
  | :COMMON_EXTENSION_NAME_CERTIFICATE_POLICIES
  | :COMMON_EXTENSION_NAME_CRL_DISTRIBUTION_POINTS
  | :COMMON_EXTENSION_NAME_SIGNED_CERTIFICATE_TIMESTAMP