A corollary to the linked article is that a specification can also have bugs. Having a specification means that you can (in theory) be sure you have removed al

A corollary to the linked article is that a specification can also have bugs. Having a specification means that you can (in theory) be sure you have removed all inconsistencies between that specification and the source code, but it does not mean you can know you have removed all bugs, since both the spec and the source code could have the same bug.