The following comment "My apologies to trypophobic readers" makes me think that the mistake was intentional.
It wasn't, but I'm glad to have plausible deniability :) I fixed the typo.
Bigger nitpick: as per RFC 5952, canonically :: is ::. 0000:0000:0000:0000:0000:0000:0000:0000 is a valid way of writing the same address, but it's not the canonical way.