No validation for non-integer ipv6 prefixes

[GitNikko]

When passing a string value as an ipv6 address prefix I assume it is getting cast to the integer of 0 and being considered a valid prefix. This is also inconsistent behaviour compared to ipv4 addresses.

Thanks

IPAddress.parse('3ffe:505:2::1/junk')
=> #<IPAddress::IPv6:0x00007fef565c36c0 @address="3ffe:0505:0002:0000:0000:0000:0000:0001", @compressed="3ffe:505:2::1", @groups=[16382, 1285, 2, 0, 0, 0, 0, 1], @prefix=0>

IPAddress.parse('192.168.1.0/junk')
ArgumentError: Invalid netmask junk