Asked whether the "magical" figure of 18 test wins in a row, which started with their big victory over the Wallabies in Auckland before they went unbeaten through the World Cup and accounted for Wales in June was more of a driving factor, Foster said: "It sounds a little bit more interesting, yeah."
He added: "It's very satisfying. I guess wrapping up the Championship is more of a consequence of us playing some really good rugby and the way some of the other results have gone. It's certainly pleasing to have it done after four rounds, but in reality it doesn't change much, does it? We've still got two games on the road, our expectations are high and I'm sure the public's are too so we've got to keep going.
"We've quite often talked about it. It's about challenging ourselves to be the best we can be.
"The Argentina game showed we were 40 minutes off in terms of our preparation - we weren't ready physically for what they chucked at us, so we challenged ourselves as a group. It wasn't just the players, it was the management to make sure we were prepared."
Should they achieve the world record, the All Blacks will turn their attention to going through the year unbeaten, which they achieved in 2013. They play Ireland in Chicago and Dublin, plus Italy in Rome and France in Paris during this year's November tour.
They are talking points for pundits and supporters, but you are unlikely to hear the All Blacks talk publicly of winning streaks and records, as lock Luke Romano reminded the media today in his uniquely direct manner.
"You don't want to get ahead of yourself and think that you're bigger than the game," Romano said. "As soon as that happens someone's going to tip you up and you're going to look like an absolute dick."