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  • Manuel Jasso thinks this is interesting:

Not properly isolating dependencies can cause untold problems. In some of the most common dependency-related problems, you could have a developer working on version X of some dependent library on his workstation, but version X+1 of that library has been installed in a central location in production.

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Cover of Beyond the Twelve-Factor App

Note

The problem is the "central location", not the varying versions which can eventually be the same.