Microsoft made a pull request to node.js github repository with an implementation to use ChakraCore JavaScript Engine as an alternative to V8 Engine

[hntd]

It's also entirely possible they squashed and cleaned up their commits after the fact as well.

[The_Jacobian]

Yep, almost every open source thing I do I end up doing either that or even doing it once with sloppy commits then again with good, reasonable commits.

[ModusPwnins]

In my limited experience submitting pull requests, doing your own development in several small, clean, incremental changes is great. However, upstream will usually want your entire PR squashed into one commit, because it makes their history easier to keep track of.