Always have a space after a comma.
Don't nest ternary operators.
Document the rationale for the differences from the rubocop standard config.
Handle warnings about methods with too many parameters.
Limit line lengths to 100 characters.
Always have a space around math operators.
Spaces should be around = for default parameters.
Get rid of some empty lines.
Comments must have a leading space.
Keep a blank line before and after each public, private, and protected declaration.
Align array literals.
Prefer && over and.
Align ends of block with the start of the expression.
Avoid conditional blocks of more than 3 levels.
The when clause should align with the case statement.
Don't use Class vars.
Don't use :: to call methods.
Handle the ConstantName cop in the one place were we assign a constant that's a class.
Prefer '' over String.new
Prefer even?/odd? over modulo 2.