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Re:A regression is the kernel not giving the same result wit... by pjmlp on Thursday November 02, 2017 @10:48AM (#15610865)
Some examples,

1 - Not all changes can be kept internal, for example adding a new case to an ADT

2 - Internal changes can still alter the semantic of the API, even if from the outside everything still looks the same from the type system point of view

Re:A regression is the kernel not giving the same result wit... by tome on Thursday November 02, 2017 @12:23PM (#15611811)
Yes, both are true. 2 is a particularly good example.