== Whitespace ==
* Use space, not tabs. You can only get away with tabs if your name is Richard Fairhurst
-* Set your editor to treat tabs as two spaces when viewing them, otherwise you'll go mad
+* Set your editor to treat tabs as four spaces when viewing them, otherwise you'll go mad
* Blank lines shouldn't have whitespace
* No trailing whitespace
* Only "fix" whitespace errors while changing that line of code for other reasons. Otherwise, it's not worth fixing.