src/main/java/org/apache/commons/validator/routines/checkdigit/ISBN10CheckDigit.java [70:109]:
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        if (charValue == 10) {  // CHECKSTYLE IGNORE MagicNumber
            return "X";
        }
        return super.toCheckDigit(charValue);
    }

    /**
     * <p>Convert a character at a specified position to an
     * integer value.</p>
     *
     * <p>Character 'X' check digit converted to 10.</p>
     *
     * @param character The character to convert.
     * @param leftPos The position of the character in the code, counting from left to right
     * @param rightPos The position of the character in the code, counting from right to left
     * @return The integer value of the character.
     * @throws CheckDigitException if an error occurs.
     */
    @Override
    protected int toInt(final char character, final int leftPos, final int rightPos)
            throws CheckDigitException {
        if (rightPos == 1 && character == 'X') {
            return 10;  // CHECKSTYLE IGNORE MagicNumber
        }
        return super.toInt(character, leftPos, rightPos);
    }

    /**
     * Calculates the <em>weighted</em> value of a character in the
     * code at a specified position.
     *
     * <p>For ISBN-10 (from right to left) digits are weighted
     * by their position.</p>
     *
     * @param charValue The numeric value of the character.
     * @param leftPos The position of the character in the code, counting from left to right
     * @param rightPos The position of the character in the code, counting from right to left
     * @return The weighted value of the character.
     */
    @Override
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src/main/java/org/apache/commons/validator/routines/checkdigit/ISSNCheckDigit.java [65:80]:
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        if (charValue == 10) { // CHECKSTYLE IGNORE MagicNumber
            return "X";
        }
        return super.toCheckDigit(charValue);
    }

    @Override
    protected int toInt(final char character, final int leftPos, final int rightPos)
            throws CheckDigitException {
        if (rightPos == 1 && character == 'X') {
            return 10; // CHECKSTYLE IGNORE MagicNumber
        }
        return super.toInt(character, leftPos, rightPos);
    }

    @Override
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