//	                 (octets 0 - 31) and DEL (127)>
func isCTL(b byte) bool {
	const del = 0x7f // a CTL
	return b < ' ' || b == del
}

// ValidHeaderFieldName reports whether v is a valid HTTP/1.x header name.
// HTTP/2 imposes the additional restriction that uppercase ASCII
// letters are not allowed.
//
// RFC 7230 says:
//
//	header-field   = field-name ":" OWS field-value OWS

	// Check if range string contains delimiter '-', else return error. eg. "bytes=8"
	sepIndex := strings.Index(byteRangeString, "-")
	if sepIndex == -1 {
		return nil, fmt.Errorf("'%s' does not have a valid range value", rangeString)
	}

	offsetBeginString := byteRangeString[:sepIndex]
	offsetBegin := int64(-1)
	// Convert offsetBeginString only if its not empty.
	if len(offsetBeginString) > 0 {

// contain release numbers ("go1.20.1" is not a valid goVersion).
type goVersion string

// asGoVersion returns v as a goVersion (e.g., "go1.20.1" becomes "go1.20").
// If v is not a valid Go version, the result is the empty string.
func asGoVersion(v string) goVersion {
	return goVersion(version.Lang(v))
}

// isValid reports whether v is a valid Go version.
func (v goVersion) isValid() bool {
	return v != ""
}

        and:
        failure.assertHasDescription("Invalid version specified for argument '--gradle-version'")
        failure.assertHasCause("'$badVersion' is not a valid Gradle version string (examples: '1.0', '1.0-rc-1')")
        failure.assertHasResolution("Specify a valid Gradle release listed on https://gradle.org/releases/.")

        {
            "detail": [
                {
                    "type": "int_parsing",
                    "loc": ["body", "size"],
                    "msg": "Input should be a valid integer, unable to parse string as an integer",
                    "input": "XL",
                }
            ],
            "body": {"title": "towel", "size": "XL"},
        }
    ) | IsDict(

                    "msg": "Input should be a valid integer, unable to parse string as an integer",
                    "input": "foo",
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["path", "item_id"],
                    "msg": "value is not a valid integer",

func TestCreateCredentials(t *testing.T) {
	testCases := []struct {
		accessKey   string
		secretKey   string
		valid       bool
		expectedErr error
	}{
		// Valid access and secret keys with minimum length.
		{alphaNumericTable[:accessKeyMinLen], alphaNumericTable[:secretKeyMinLen], true, nil},
		// Valid access and/or secret keys are longer than minimum length.

					name:       "remote-jwks-without-service-entry",
					policyFile: "./testdata/requestauthn-no-se.yaml.tmpl",
					customizeCall: func(t framework.TestContext, from echo.Instance, opts *echo.CallOptions) {
						opts.HTTP.Path = "/valid-token-forward-remote-jwks"
						opts.HTTP.Headers = headers.New().WithAuthz(jwt.TokenIssuer1).Build()
						opts.Check = check.And(
							check.NotOK(),
							check.Status(http.StatusUnauthorized))
					},
				},

	//
	// File versions require a valid package version to be provided to types
	// in Config.GoVersion. Config.GoVersion is either from the package's module
	// or the toolchain (go run). This value should be provided by go/packages
	// or unitchecker.Config.GoVersion.
	if v := info.FileVersions[file]; IsValid(v) {
		return v
	}
	// Note: we could instead return runtime.Version() [if valid].

     */
    boolean isConfigured();

    /**
     * A spec is valid when {@link #getLanguageVersion() language version} is set (along with any other properties)
     * or when no properties are set.
     * <p>
     * A {@link #isConfigured() non-configured} spec is always valid.
     */
    boolean isValid();

    /**