@Override
    public @NonNull Iterable<@NonNull String> stringSuggestions(final @NonNull CommandContext<C> commandContext,
                                                                final @NonNull CommandInput input) {
        if (!this.liberal) {
            return STRICT_LOWER;
        }

        return LIBERAL_LOWER;
    }
Construct a new boolean parser

@param liberal Whether it'll accept boolean-esque strings, or just booleans
cloud-core/src/main/java/org/incendo/cloud/parser/standard/BooleanParser.java