rhino/src/main/java/org/mozilla/javascript/ScriptRuntime.java [3643:3669]:
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        final boolean post = (incrDecrMask & Node.POST_FLAG) != 0;

        Number number;
        if (value instanceof Number) {
            number = (Number) value;
        } else {
            number = toNumeric(value);
        }

        Number result;
        if (number instanceof BigInteger) {
            if ((incrDecrMask & Node.DECR_FLAG) == 0) {
                result = ((BigInteger) number).add(BigInteger.ONE);
            } else {
                result = ((BigInteger) number).subtract(BigInteger.ONE);
            }
        } else if (number instanceof Integer) {
            if ((incrDecrMask & Node.DECR_FLAG) == 0) {
                result = ((Integer) number).intValue() + 1;
            } else {
                result = ((Integer) number).intValue() - 1;
            }
        } else {
            if ((incrDecrMask & Node.DECR_FLAG) == 0) {
                result = number.doubleValue() + 1.0;
            } else {
                result = number.doubleValue() - 1.0;
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rhino/src/main/java/org/mozilla/javascript/ScriptRuntime.java [3691:3717]:
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        final boolean post = (incrDecrMask & Node.POST_FLAG) != 0;

        Number number;
        if (value instanceof Number) {
            number = (Number) value;
        } else {
            number = toNumeric(value);
        }

        Number result;
        if (number instanceof BigInteger) {
            if ((incrDecrMask & Node.DECR_FLAG) == 0) {
                result = ((BigInteger) number).add(BigInteger.ONE);
            } else {
                result = ((BigInteger) number).subtract(BigInteger.ONE);
            }
        } else if (number instanceof Integer) {
            if ((incrDecrMask & Node.DECR_FLAG) == 0) {
                result = ((Integer) number).intValue() + 1;
            } else {
                result = ((Integer) number).intValue() - 1;
            }
        } else {
            if ((incrDecrMask & Node.DECR_FLAG) == 0) {
                result = number.doubleValue() + 1.0;
            } else {
                result = number.doubleValue() - 1.0;
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