@Override
  public List<ProgramOption> getProgramOptions() {
    return List.of(ProgramOption.functions(
      builtInFunctions.stream().flatMap(b -> b.implementations().stream()).toArray(Overload[]::new)
    ));
  }
Creates a {@link Library} of built-in functions that can be made available to dynamic expressions.
planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/expression/stdlib/PlanetilerLib.java