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The behaviour of q primitives and KX namespace objects occasionally changes. Most such changes are extensions: what was formerly an error now does something useful. The Reference does not always note in which version the extension was made. If your version of q does not behave as described, check the Release Notes.
Very occasionally a change breaks earlier behavior. The Reference documents such changes; generally for one major version. Currently, the Reference should show any breaking changes introduced since V3.0; for anything earlier, see the Release Notes.