docs: def get_artifact_filename(self, package_name, artifact_name):
          """
          Similar to pkg_resources.resource_filename, however this works
          with the information cached in this registry instance, and
          arguments are not quite the same.
  
          Arguments:
  
          package_name
              The name of the package to get the artifact from
          artifact_name
              The exact name of the artifact.
  
          Returns the path of where the artifact should be if it has been
          declared, otherwise None.
          """
  
          project_name = self.packages.normalize(package_name)
          return self.records.get((project_name, artifact_name))