It'd be good to use a common style for the code in the repo (what exact style we use is much less important than the universality of its application). We have at least the following options:

1. Add an EditorConfig file to the root of the repo (jeff.yemin provided his .editorconfig). This way both internal and external contributors will use the same code style, provided that they have IDE / text editor that supports this format (IntelliJ IDEA does: https://www.jetbrains.com/help/idea/configuring-code-style.html#editorconfig).
2. JAVA-3809.