node.js v4.0.0 released, merged with io.js

node.js 4.0 released few days ago:
https://nodejs.org/en/blog/release/v4.0.0/
https://github.com/nodejs/node/releases/

node.js now migrated/merged with io.js and has new engine, features and may also have performance increase, see:

I just did a very very simple test use npm test on cdnjs/cdnjs

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