code: public Map<String, PubApi> getPubapis(Collection<JavaFileObject> explicitJFOs, boolean explicits) {
  
          // Maps ":java.lang" to a package level pub api (with only types on top level)
          Map<String, PubApi> result = new HashMap<>();
          for (ClassSymbol cs : publicApiPerClass.keySet()) {
  
              boolean amongExplicits = explicitJFOs.contains(cs.sourcefile);
              if (explicits != amongExplicits)
                  continue;
  
              String pkg = ":" + cs.packge().fullname;
              PubApi currentPubApi = result.getOrDefault(pkg, new PubApi());
              result.put(pkg, PubApi.mergeTypes(currentPubApi, publicApiPerClass.get(cs)));
          }
  
          return result;
      }
docs: Convert the map from class names to their pubapi to a map
  from package names to their pubapi.