> You can open a file with O_EXCL if you pass in the open flags as a number. (You can find them on require("constants"), and they need to be binary-OR'ed together.) This isn't documented. It should be. It should probably also be exposed in a cleaner way.

That's great to know. Obviously I'm just following the docs.

> Most of the rest of what you describe is APIs that need to be polished and refined a bit

My concern is merely that there have been a number of statements put out saying "we won't be adding anything more to the API", and that we are basically almost at 1.0, at which point there won't ever be anything added to the core API. Lack of flock() is huge (you can't write to an existing file safely without it - and Node developers are doing that all the time, including your own NPM). Lack of an ability to create temporary files safely seems a fundamental weakness - especially when so many Node apps are dealing with file uploads - that's a disaster waiting to happen. We are going to be dealing with Node.js security bugs because of these issues for a VERY long time.