sS replaceSquareBracketVars(S s, O... params) {
  if (empty(params)) ret s;
  MapSO vars = litmap(params);
  regexpReplaceIC(s, "\\[(.+?)\\]", matcher -> {
    S var = matcher.group(1);
    O val = vars.get(var);
    ret val == null ? var : str(val);
  });
}