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OS 0.27.1 does not ask for saving modified experiments, as it was a pre-release.
Right, thanks for pointing this out! I simply forgot to set devmode to False while packaging 0.27.1.
I don't think it's worth releasing a new bug-fix only for this, but I'll make sure I don't forget for 0.27.2.
There's much bigger issues in the world, I know. But I first have to take care of the world I know.