Mark Andrews writes:
> why is the last sentence here with a SHOULD.

It technically doesn't hurt anything to include them, because the
option length field of the opt rdata tells you how long the variable
part is.  If there is an important technical reason that MUST is
required here for interoperability I'm happy to change it, but it does
not appear to be a fundamental requirement.

>    o  ADDRESS, variable number of octets, contains either an IPv4 or
>       IPv6 address, depending on FAMILY, truncated to the number of bits
>       indicated by the SOURCE PREFIX-LENGTH field, with bits set to 0 to
>       pad to the end of the last octet needed.  Trailing all-zero octets
>       SHOULD be omitted.

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