needs DNS 0x20 (mixed case) support

Hi,
It fails to reply to queries such as 1-2-3-4.dOmaIn.cOm, it only works with lower case ones.
This causes it to fail LetsEncrypt cert requests.

RFC is here https://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00
https://unboundtest.com/ can be used for testing (Letsencrypt uses similar)

Thanks!