Confused about --doh/--resolve

I'm confused about what a command like this does:
   curl --ipv4 --resolve cloudflare-dns.com:443:104.16.248.249 \
     --doh-url https://cloudflare-dns.com/dns-query \
     https://clienttest.ssllabs.com:8443/ssltest/viewMyClient.html

First, I note curl connects to 'cloudflare-dns.com' using IPv6
even though I specified '--ipv4' and added 'cloudflare-dns.com's
IPv4 address to this "fake" DNS-cache.

Adding a '-v', I see this confusing trace:
   * family0 == v6, family1 == v4
   * Trying 2606:4700::6810:f8f9:443...

'curl -M' says this:
   -4, --ipv4
       This option tells curl to resolve names to IPv4 addresses only,
       and not for example try IPv6.

I would expect that to be valid for a '--doh-url' too.

Now, it's like curl won't use this DNS-cache at all.
I don't get it.

-- 
--gv
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