We already did that when parsing from CBOR binary data, so the code was
already present.
[ChangeLog][QtCore][QCborValue] The constructor taking a CBOR tag and a
value to be tagged now attempts to convert to a QCborValue extended
type. For example, if the tag is 0 (UnixTime_t) and the payload is a
number, the resulting object will become tag 1 (DateTime) and the
payload will be the the ISO-8601 date/time string.
Fixes: QTBUG-79196
Change-Id: I6edce5101800424a8093fffd15cdf650fb2fc45c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
bcbefcd645