static LS mapToLines(Map map) {
  new L<S> l;
  for (O key : keys(map))
    l.add(str(key) + " = " + str(map.get(key)));
  ret l;
}

sS mapToLines(Map map, O f) {
  ret lines(map(map, f));
}

sS mapToLines(O f, Map map) {
  ret lines(map(map, f));
}

sS mapToLines(O f, Iterable l) {
  ret lines(map(f, l));
}

static <A> S mapToLines(Iterable<A> l, IF1<A, S> f) {
  ret mapToLines((O) f, l);
}

static <A> S lambdaMapLike mapToLines(IF1<A, S> f, Iterable<A> l) {
  ret mapToLines((O) f, l);
}

static <A, B> S mapToLines(Map<A, B> map, IF2<A, B, S> f) {
  ret lines(map(map, f));
}

static <A> S mapToLines(IF1<A, S> f, A data1, A... moreData) {
  ret lines(map(f, data1, moreData));
}