public long getLong(String key, String description, long defaultValue) {
    String value = getArg(key, Long.toString(defaultValue));
    long parsed = Long.parseLong(value);
    logArgValue(key, description, parsed);
    return parsed;
  }
Returns an argument as long.

@throws NumberFormatException if the argument cannot be parsed as a long
planetiler-core/src/main/java/com/onthegomap/planetiler/config/Arguments.java