code: public void setBoolean(Enum<?> key, boolean value)
      {
          if (key == null)
          {
              return;
          }
  
          setBoolean(key.name(), value);
      }
docs: Equivalent to {@link #setBoolean(String, boolean)
  setBoolean}{@code (key.name(), value)}.
  If {@code key} is null, nothing is done.