[zmmmmm]

Still - that's an excellent example of something that's broken by default and outright dangerous for production use and at the same time very convenient when using interactively. There are probably half a dozen similar other features.

The vast majority of packages are written by somebody taking their interactive session and tidying it up with some functions and tests and then publishing it. But going through and weeding out all these "broken by default for edge case" aspects is a nightmare.