public boolean getBoolean(String key, String description, boolean defaultValue) {
    boolean value = "true".equalsIgnoreCase(getArg(key, Boolean.toString(defaultValue)));
    logArgValue(key, description, value);
    return value;
  }
Returns a boolean parsed from {@code key} argument where {@code "true"} is true and anything else is false.
planetiler-core/src/main/java/com/onthegomap/planetiler/config/Arguments.java