All of ROA, MFT, ASPA, and RSC define their respective 'version' field
in ASN.1 as following: "version [0] INTEGER DEFAULT 0,". Each object
profile preamble contains "DEFINITIONS EXPLICIT TAGS ::=".
We didn't bump into any issue yet, because all Signed Objects are at
version 0, which means the field is entirely omitted (including the tag,
be it implicit or explicit). (From X.690 section 11.5: "The encoding of
a set value or a sequence value shall not include an encoding for any
component value which is equal to its default value.")
OK tb@