public CopyOptions numberConverter(final String pattern, final CharSequence... propertyNames) {
        assertArgumentNotEmpty("pattern", pattern);

        return converter(new NumberConverter(pattern), propertyNames);
    }

    /**
     * {@literal CharSequence}の配列を{@literal String}の{@literal List}に変換します。
     *
     * @param array
     *            {@literal CharSequence}の配列
     * @return {@literal String}の{@literal List}