Prefer IPv6 over IPv4-in-IPv6

[edaniels]

Description

This helps with a case like docker offering up IPv4-in-IPv6 addresses

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.18%. Comparing base (78fee6f) to head (423a469).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
+ Coverage   64.92%   66.18%   +1.26%     
==========================================
  Files           1        1              
  Lines         824      837      +13     
==========================================
+ Hits          535      554      +19     
+ Misses        210      206       -4     
+ Partials       79       77       -2     

Flag	Coverage Δ
go	66.18% <100.00%> (+1.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.