Fix , in long TXT data #31
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I use amphp/dns which rely on libdns and i discovered that all my DKIM TXT queries wasn't valid.
I found some "," in all response.
For exemple with google dkim: TXT of 20230601._domainkey.gmail.com
libdns give me: (import part is 4T4HZb2,PY2bQtE)
and nslookup -type=txt 20230601._domainkey.gmail.com: (important part is 4T4HZb2" "PY2bQtE)
libdns obviously implode both data field with a , which give a wrong answer.
So this small PR fixe the issue but i don't know if it's brakes something else or a proper fix for master branch.