sS indentx(O s) {
  ret indentx(strOrEmpty(s));
}

static S indentx(S s) {
  return indentx(indent_default, s);
}

static S indentx(int n, S s) {
  return dropSuffix(repeat(' ', n), indent(n, s));
}

static S indentx(S indent, S s) {
  return dropSuffix(indent, indent(indent, s));
}