Where is the "safe write" setting stored?

System settings -> Use "safe writes" interferes with many hot reloading systems and the like. It's easy to disable, but also easy to overlook for new WebStorm installations, or users who work on a web project for the first time.

It would be great if this setting were configurable per project, so that it could be included in the `.idea` directory, and committed to VCS along with the other IDE settings.

However, it seems it's stored somewhere in the system settings, and I couldn't figure out how to store it in the code repo.