How can I update my input and output from 0.15.1 to 0.15.2?

It is not stupid. Version 0.15.2 accidentally introduced a breaking change that affected you. Your code worked in 0.15.1 because of the bug. But the bugfix involving breaking change was intended for 0.16 and not for 0.15.x. All of this is a bit too complicated to understand considering that release notes are absent. Your question is perfectly reasonable.

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