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The buildbot is showing unsuccessful builds. Should I change anything?

No, someone else broke it. Just wait until #2889 is merged.

How to run the buildbot again? Do i have to recommit?

Don't do anything. I'll do it myself.

@nisargthakkar, @SpecLad, don't you think we should also add cols = rows = dims = flags = 0?

yes, i agree. We should make that change

cols and rows are the same as size[0] and size[1]. I think dims is used to avoid reallocating the size array on .create() if the new number of dimensions is the same as the old one (although the logic is convoluted enough that I can't say for sure that's the case), and I think people might be relying on it not changing, so I think we should leave it alone. As for flags... maybe. I'll have to check whether that affects anything.