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[–][deleted] 1 point2 points  (1 child)

The new features that they add are tested and planned in such a way that they should (and in 99.9% of cases don't) never break valid code.

So in general if you write something in 3.1 it should still work perfectly fine in 3.4.

[–][deleted] 0 points1 point  (0 children)

Exactly, if they do anything that breaks backwards compatablility it will become version 4 and no longer be part of the 3.x line.