t.Fatal("exec insert", err)
	}
	var (
		str1 string
		dec1 decimalInt
		arr1 []int64
	)
	err = db.QueryRowContext(ctx, "SELECT|keys|dec1,str1,array1|").Scan(&dec1, &str1, &arr1)
	if err != nil {
		t.Fatal("select", err)
	}

	list := []struct{ got, want any }{
		{o1, "from-server"},
		{dec1, decimalInt{123}},
		{str1, "hello"},
		{arr1, []int64{42, 128, 707}},
	}

			obj: map[string]interface{}{
				"str": "this is a 123 string 456",
			},
			schema: objectTypePtr(map[string]schema.Structural{
				"str": stringType,
			}),
			valid: []string{
				"self.str.find('[0-9]+') == '123'",
				"self.str.find('[0-9]+') != '456'",
				"self.str.find('xyz') == ''",

				"self.str.findAll('[0-9]+') == ['123', '456']",
				"self.str.findAll('[0-9]+', 0) == []",

func lcpSuffix(strs []string) string {
	return lcp(strs, false)
}

func lcp(strs []string, pre bool) string {
	// short-circuit empty list
	if len(strs) == 0 {
		return ""
	}
	xfix := strs[0]
	// short-circuit single-element list
	if len(strs) == 1 {
		return xfix
	}
	// compare first to rest
	for _, str := range strs[1:] {
		xfixl := len(xfix)
		strl := len(str)

	}

	// Look for the expected things in the coverage profile.
	contents, err := os.ReadFile(textfile)
	strc := string(contents)
	if err != nil {
		t.Fatalf("problems reading text file %s: %v", textfile, err)
	}
	if !strings.Contains(strc, token) {
		t.Logf("content: %s\n", string(contents))
		t.Fatalf("cov profile does not contain aux meta content %q", token)
	}

}

// Get the server port from server.URL (e.g., https://127.0.0.1:36253)
func getServerPort(server *httptest.Server) (int, error) {
	strs := strings.Split(server.URL, ":")
	if len(strs) < 2 {
		return 0, fmt.Errorf("server.URL is invalid: %v", server.URL)
	}
	port, err := strconv.Atoi(strs[len(strs)-1])
	if err != nil {
		return 0, fmt.Errorf("error to extract port from URL: %v", server.URL)
	}
	return port, nil
}

    ```

The query parameter `q` is of type `Union[str, None]` (or `str | None` in Python 3.10), that means that it's of type `str` but could also be `None`, and indeed, the default value is `None`, so FastAPI will know it's not required.

!!! note
    FastAPI will know that the value of `q` is not required because of the default value `= None`.

        return new AbstractIterator<E>() {
          final Iterator<? extends E> itr1 = set1.iterator();
          final Iterator<? extends E> itr2 = set2.iterator();

          @Override
          @CheckForNull
          protected E computeNext() {
            if (itr1.hasNext()) {
              return itr1.next();
            }
            while (itr2.hasNext()) {
              E e = itr2.next();

// problematic types such as pointers. Note that it only does special handling
// for the troublesome types used in the test cases; it is not a general
// printer.
func sprintKey(key reflect.Value) string {
	switch str := key.Type().String(); str {
	case "*int":
		ptr := key.Interface().(*int)
		for i := range ints {
			if ptr == &ints[i] {
				return fmt.Sprintf("PTR%d", i)
			}
		}
		return "PTR???"
	case "unsafe.Pointer":

	Bo bool `json:"bo,omitempty"`

	Ur uint `json:"ur"`
	Uo uint `json:"uo,omitempty"`

	Str struct{} `json:"str"`
	Sto struct{} `json:"sto,omitempty"`
}

func TestOmitEmpty(t *testing.T) {
	var want = `{
 "sr": "",
 "omitempty": 0,
 "slr": null,
 "mr": {},
 "fr": 0,
 "br": false,
 "ur": 0,
 "str": {},
 "sto": {}
}`
	var o Optionals
	o.Sw = "something"
	o.Mr = map[string]any{}

	c *string
	d map[float64]float64
}

func TestDeepEqualComplexStruct(t *testing.T) {
	m := make(map[float64]float64)
	stra, strb := "hello", "hello"
	a, b := new(_Complex), new(_Complex)
	*a = _Complex{5, [3]*_Complex{a, b, a}, &stra, m}
	*b = _Complex{5, [3]*_Complex{b, a, a}, &strb, m}
	if !DeepEqual(a, b) {
		t.Error("DeepEqual(complex same) = false, want true")
	}
}