code: protected ClassInfo mergeClassConfigInfo(ClassInfo classInfo) {
          // Update introspected class information from introspected package
          PackageInfo packageInfo = configFileParser.getPackageInfo(classInfo.getInternalPackageName());
          if (packageInfo == null) {
              packageInfo = getPackageInfo(classInfo.getInternalPackageName());
          }
          classInfo.updateDefaultValuesFromPackageInfo(packageInfo);
  
          // Override introspected class information from configuration document
          ClassInfo ci = configFileParser.getClassInfo(classInfo.getInternalClassName());
          if (ci != null) {
              classInfo.overrideValuesFromExplicitClassInfo(ci);
          }
  
          return classInfo;
      }
docs: Attempt to normalize the various levels of configuration information
  prior to instrumenting a class.