code: public StringBuilder appendTo(StringBuilder builder, Map<?, ? extends Collection<?>> map) {
  		return appendTo(builder, map.entrySet());
  	}
docs: Appends the string representation of each entry of {@code map}, using the previously configured separator and
  key-value separator, to {@code builder}. Identical to {@link #appendTo(Appendable, Map)}, except that it
  does not throw {@link IOException}.