I dislike they jumped from 0.1x (and io.js) to 4 and a months later the realise v8 semver is 5 and jump to 5 - stupid.

They could have though about version numbers last months, and choose 5.

A bit more conservative version numbering would be great. Nodejs up to 0.1x was to slow, and now it's way to fast - a application runtime is not a browser. Mind the library compatibility - not every dev has time to test for 0.1x, 4.x and now 5.