settable values, even when they are inherited
* However they do not require tags matching: IMPLICIT/EXPLICIT tags will
be set automatically in the given sequence
+* Descriptive errors, like ``pyderasn.DecodeError: UTCTime
+ (tbsCertificate.validity.notAfter.utcTime) (at 328) invalid UTCTime format``
* ``__slots__`` friendliness
* Could be significantly faster. For example parsing of CACert.org's CRL
under Python 3.5.2: