I have a custom domain (from Namecheap) and have set it up to use Netlify’s DNS by adding the 4 nameservers to the Namecheap DNS control panel.
Everything is working apart from the naked domain is not automatically redirecting to the www subdomain. From what I can tell, this is supposed to ‘just work’.
I haven’t changed any of the default DNS records that Netlify sets, and I can see records in there for www and non-www domains.
I have also added IP6 hoping that might help, but with no luck.