go down the road until you get to the stop sign. does that mean you pass the stop sign and then stop in the intersection.? no it means stop there and do not go any farther.
"until" can only be used with a time phrase, so "go until the end of the road" really means "go until the time you reach the end" but using your use of the word until I will post another phrase.

"I read the book up until page 45."
Am I saying I stopped at the last word on Page 44?
...or am I saying somewhere on Page 45 (summer) I stopped, possibly the end of it?

Answer is that I was reading the book until I hit page 45 and then something changed.
(Continuous action to the moment of change).

Simply making 1 instance examples doesn't change that at the beginning of the instance you were still doing it. The longer the period of time following "until" the more unclear it is when the moment of change actually occurs, but it does (in Yoshida's sentence) include "summer."

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I'm trying to teach you guys something, not troll.
I know how confusing that can be in a world where everyone likes to be right.