DoH proxy: https-dns-proxy new RFC8484-supporting package and Web UI

Is that IPv4-only for requests or replies? Cause I'm getting ipv6 replies all the time:

Non-authoritative answer:
Name:    google.com
Addresses:  2a00:1450:4010:c0b::66
          2a00:1450:4010:c0b::8a
          2a00:1450:4010:c0b::64
          2a00:1450:4010:c0b::65
          74.125.205.102
          74.125.205.113
          74.125.205.101
          74.125.205.100
          74.125.205.139
          74.125.205.138

Is there an option to get only ipv4 replies?