Certificate serial stored as Decimal instead of Hex

When a certificate is created by cfssl it stores the serial number as a Decimal entry while the serial number is stored as hex in the cert it self.
When doing a ocsp test using openssl it sends the serial number as a hex string which cfssl can't find in the database when using ocspserve.

Also found out that cfss-certinfo parses the serial number as a decimal entry instead of Hex.

Feels like a bug :-)