always returns false for IPV6 IPs

[catharsis71]

running on an IPV6 IP the result is always false

$ istorexit 2a0b:f4c2:1::175
2a0b:f4c2:1::175 false

although you can see here that this is an exit node: https://metrics.torproject.org/rs.html#details/F03267E78461E198C7A8D3E825146895B19BFD1A