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I'm using node v5 but netbeans only downloads node sources 0.12.7
You are right. This is basically intended. The sources of Node.js from version 4 are written in EcmaScript 6. Unfortunately NetBeans are not able to parse these sources yet, so they downloads sources 0.12.7. Currently I'm working on the parser for EcmaScript6 and when this will be done, then this issue can be fixed.
Looking at the code - this seems to be already resolved.
I have change the logic during development of NB 8.2