OptionaldcAddresses that recently failed to connect (address key → performance.now() of the failure).
Shared between all connections to the same DC, so that they can skip these addresses
OptionaldcAddresses of the same DC to try (in order) if connecting to dc fails
OptionaldisableOptionalfloodif present, each connection gates its connects through its own flood controller
OptionalinactivityOptionaluseOptionalwith
DC to connect to. Updated when switching to one of dcFallbacks