{DefaultParameterConverter, now, now, ""},
	{DefaultParameterConverter, (*int64)(nil), nil, ""},
	{DefaultParameterConverter, &answer, answer, ""},
	{DefaultParameterConverter, &now, now, ""},
	{DefaultParameterConverter, i(9), int64(9), ""},
	{DefaultParameterConverter, f(0.1), float64(0.1), ""},
	{DefaultParameterConverter, b(true), true, ""},

// It exists for compatibility.
func IsScanValue(v any) bool {
	return IsValue(v)
}

// DefaultParameterConverter is the default implementation of
// [ValueConverter] that's used when a [Stmt] doesn't implement
// [ColumnConverter].
//
// DefaultParameterConverter returns its argument directly if
// IsValue(arg). Otherwise, if the argument implements [Valuer], its

		return driver.NotNull{Converter: driver.DefaultParameterConverter}
	case "nullint64":
		// TODO(coopernurse): add type-specific converter
		return driver.Null{Converter: driver.DefaultParameterConverter}
	case "float64":
		// TODO(coopernurse): add type-specific converter
		return driver.NotNull{Converter: driver.DefaultParameterConverter}
	case "nullfloat64":

type valueConverterTest struct {
	c       driver.ValueConverter
	in, out any
	err     string
}

var valueConverterTests = []valueConverterTest{
	{driver.DefaultParameterConverter, NullString{"hi", true}, "hi", ""},
	{driver.DefaultParameterConverter, NullString{"", false}, nil, ""},
}

func TestValueConverters(t *testing.T) {
	for i, tt := range valueConverterTests {
		out, err := tt.c.ConvertValue(tt.in)

// function signature as the CheckNamedValue in the driver.NamedValueChecker
// interface.
func defaultCheckNamedValue(nv *driver.NamedValue) (err error) {
	nv.Value, err = driver.DefaultParameterConverter.ConvertValue(nv.Value)
	return err
}

// driverArgsConnLocked converts arguments from callers of Stmt.Exec and
// Stmt.Query into driver Values.
//

//
// The [database/sql] package checks for value checkers in the following order,
// stopping at the first found match: Stmt.NamedValueChecker, Conn.NamedValueChecker,
// Stmt.ColumnConverter, [DefaultParameterConverter].
//
// If CheckNamedValue returns [ErrRemoveArgument], the [NamedValue] will not be included in
// the final query arguments. This may be used to pass special options to
// the query itself.
//

		{"Bool", Var, 0},
		{"ColumnConverter", Type, 0},
		{"Conn", Type, 0},
		{"ConnBeginTx", Type, 8},
		{"ConnPrepareContext", Type, 8},
		{"Connector", Type, 10},
		{"DefaultParameterConverter", Var, 0},
		{"Driver", Type, 0},
		{"DriverContext", Type, 10},
		{"ErrBadConn", Var, 0},
		{"ErrRemoveArgument", Var, 9},
		{"ErrSkip", Var, 0},
		{"Execer", Type, 0},

pkg database/sql/driver, type Valuer interface { Value }
pkg database/sql/driver, type Valuer interface, Value() (Value, error)
pkg database/sql/driver, var Bool boolType
pkg database/sql/driver, var DefaultParameterConverter defaultConverter
pkg database/sql/driver, var ErrBadConn error
pkg database/sql/driver, var ErrSkip error
pkg database/sql/driver, var Int32 int32Type
pkg database/sql/driver, var ResultNoRows noRows