Priority for extractors

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #107 
| License       | MIT
| Doc PR        | need to be written
i struggle a little bit with it. Think the default value for the method is wrong. I just had errors from tests. Nobody should call the method except the compiler pass, right? So i would like to remove the default and leave 0 as default - not `null` - in compiler pass.