In the github article it uses different commands than are shown in the comments of LEDE at /etc/config/dnscrypt-proxy. (The github page: https://github.com/jedisct1/dnscrypt-proxy/wiki/Go-faster)
Am I reading the LEDE comments correctly (/etc/config/dnscrypt-proxy) that to set "BlockIPv6 yes" I should use this command:
option block_ipv6 '0'
And to set "LocalCache on", I should set this:
option local_cache '0'