Also, I'd never say "SHOULD". Say "MUST", so first of all there is no doubt: "Use strict! No exceptions.And I was just going to commend Abigail for using SHOULD for a lot of the guidelines.
They are guidelines after all - and there are situations where this or that rule is not appropriate. The programmer should not have to go through hoops to code around the limitation imposed by the rule (but should provide appropriate reasoning why the rule should not be applied).