[pdovy]

> It is important to really think through the logic here: if Johnson wanted to stop Parliament he would delayed until AFTER October 31. He didn't do this.

I don't think the logic leads to this conclusion. His calculus may have been that the prorogation would be more likely to be successfully challenged if it _clearly_ cut parliament out of the process altogether. By leaving some time for them to sit ahead of his October 31st deadline he likely hoped that the prorogation would stand, he could negotiate a deal, downplay the possiblity of an extension, and then force a vote to approve the deal as the only alternative to a no-deal Brexit given the short timeline.