// updated.
		return nil
	}

	argVal := val
	if funcName != aggFnCount {
		// All aggregation functions, except COUNT require a
		// numeric argument.

		// Here, we diverge from Amazon S3 behavior by
		// inferring untyped values are numbers.
		if !argVal.isNumeric() {
			if i, ok := argVal.bytesToInt(); ok {
				argVal.setInt(i)
			} else if f, ok := argVal.bytesToFloat(); ok {
				argVal.setFloat(f)

	case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		i, err := d.number()
		return i, Number, err
	case '-':
		if c = d.next(); c < '0' || c > '9' {
			return nil, Unknown, d.mkError(ErrSyntax, "in negative numeric literal")
		}
		n, err := d.number()
		if err != nil {
			return nil, Unknown, err
		}
		return -n, Number, nil
	case 'f':
		if d.remaining() < 4 {
			return nil, Unknown, d.mkError(ErrUnexpectedEOF)

Sitemap:    # empty sitemap (should be ignored)
Sitemap: not-a-valid-url

# Case 12: Malformed lines that should be completely ignored
This line is completely invalid
:NoKey
NoValue:
:::
   :

# Case 13: Numeric crawl-delay edge cases
User-agent: NumericBot
Crawl-delay: 0
Crawl-delay: 999999999
Crawl-delay: 1.23e10

# Case 14: Tab characters instead of spaces
User-agent:	TabBot
Disallow:	/tab1/
Allow:	/tab2/

var convertibleTypes = []reflect.Type{reflect.TypeOf(time.Time{}), reflect.TypeOf(false), reflect.TypeOf([]byte{})}

// RegEx matches only numeric values
var numericPlaceholderRe = regexp.MustCompile(`\$\d+\$`)

func isNumeric(k reflect.Kind) bool {
	switch k {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return true

type CastFunc struct {
	Expr     *Expression `parser:" \"CAST\" \"(\" @@ "`
	CastType string      `parser:" \"AS\" @(\"BOOL\" | \"INT\" | \"INTEGER\" | \"STRING\" | \"FLOAT\" | \"DECIMAL\" | \"NUMERIC\" | \"TIMESTAMP\") \")\" "`
}

// SubstringFunc represents SUBSTRING sql function
type SubstringFunc struct {
	Expr *PrimaryTerm `parser:" \"SUBSTRING\" \"(\" @@ "`
	From *Operand     `parser:" ( \"FROM\" @@ "`

    }

    @Test
    @DisplayName("Constants: values match Windows error codes")
    void constants_have_expected_values() {
        // Ensure each public constant has its documented numeric value (happy path)
        assertAll(() -> assertEquals(0, WinError.ERROR_SUCCESS), () -> assertEquals(5, WinError.ERROR_ACCESS_DENIED),

     * <ul>
     * <li>Invalid directive formats</li>
     * <li>Unknown directives</li>
     * <li>Invalid crawl-delay values (non-numeric, negative)</li>
     * <li>Directives before any User-agent declaration (ignored)</li>
     * <li>Empty values for directives</li>
     * </ul>
     *

        int LIST_ITEM = 2;
        int COMBINATION_ITEM = 5;

        int compareTo(Item item);

        int getType();

        boolean isNull();
    }

    /**
     * Represents a numeric item in the version item list that can be represented with an int.
     */
    private static class IntItem implements Item {
        private final int value;

        public static final IntItem ZERO = new IntItem();

	// is used when autogenerating new credentials.
	// There is no max length enforcement for secret keys
	secretKeyMaxLen = 40

	// Alpha numeric table used for generating access keys.
	alphaNumericTable = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

	// Total length of the alpha numeric table.
	alphaNumericTableLen = byte(len(alphaNumericTable))

	reservedChars = "=,"
)

	lval, lerr := e.Left.evalNode(r, tableAlias)
	if lerr != nil || len(e.Right) == 0 {
		return lval, lerr
	}

	// Process remaining child nodes - result must be
	// numeric. This AST node is for terms separated by + or -
	// symbols.
	for _, rightTerm := range e.Right {
		op := rightTerm.Op
		rval, rerr := rightTerm.Right.evalNode(r, tableAlias)
		if rerr != nil {
			return nil, rerr