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@mwop @Crell

Amen to that.

If the incompatibilities are so subtle that it is not possible to build automated code scanners to identify them, there's gonna be little appetite for product owners to green-light an app upgrade / php version migration, esp. taking into account that a huge amount of applications, unlike libraries, do not even have automated testing in place.

"if it ain't broken don't fix it" is a tough proposition to beat