code: private void implPutAll(Map t) {
          for (Map.Entry e : ((Map<?,?>)t).entrySet()) {
              implPut(e.getKey(), e.getValue());
          }
          if (registered) {
              Security.increaseVersion();
          }
      }
docs: Copies all of the mappings from the specified Map to this provider.
  Internal method to be called AFTER the security check has been
  performed.