ft := from.Type
	if offset == 0 {
		if ft == pt {
			return from
		}
		// This captures common, (apparently) safe cases.  The unsafe cases involve ft == uintptr
		if (ft.IsPtr() || ft.IsUnsafePtr()) && pt.IsPtr() {
			return from
		}
	}
	// Simplify, canonicalize
	for from.Op == OpOffPtr {
		offset += from.AuxInt
		from = from.Args[0]
	}
	if from == x.sp {

			// (via under(t)) a possibly incomplete type.
			embeddedTyp := typ // for closure below
			embeddedPos := pos
			check.later(func() {
				t, isPtr := deref(embeddedTyp)
				switch u := under(t).(type) {
				case *Basic:
					if !isValid(t) {
						// error was reported before
						return
					}
					// unsafe.Pointer is treated like a regular pointer

	}
	return reflect.TypeOf(value).Kind()
}

// IsString reports whether value is a string type.
func IsString(value any) bool {
	return kindOf(value) == reflect.String
}

// IsPtr reports whether value is a ptr type.
func IsPtr(value any) bool {
	return kindOf(value) == reflect.Ptr
}

// IsMap reports whether value is a map type.
func IsMap(value any) bool {
	return kindOf(value) == reflect.Map
}

    (Load <t.FieldType(0)> (OffPtr <t.FieldType(0).PtrTo()> [0]             ptr) mem)
    (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem)
    (Load <t.FieldType(2)> (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] ptr) mem))
(Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 4 && CanSSA(t) =>
  (StructMake4
    (Load <t.FieldType(0)> (OffPtr <t.FieldType(0).PtrTo()> [0]             ptr) mem)

	}

	if namespaceIsSet {
		paramRef.Namespace = matchingNamespace
	}

	if denyNotFound {
		paramRef.ParameterNotFoundAction = ptrTo(admissionregistrationv1.DenyAction)
	} else {
		paramRef.ParameterNotFoundAction = ptrTo(admissionregistrationv1.AllowAction)
	}

	compiler := &fakeCompiler{}
	matcher := &fakeMatcher{
		DefaultMatch: true,
	}

// index'th field of the given expression, which must be of struct or
// pointer-to-struct type.
func DotField(pos src.XPos, x ir.Node, index int) *ir.SelectorExpr {
	op, typ := ir.ODOT, x.Type()
	if typ.IsPtr() {
		op, typ = ir.ODOTPTR, typ.Elem()
	}
	if !typ.IsStruct() {
		base.FatalfAt(pos, "DotField of non-struct: %L", x)
	}

	// TODO(mdempsky): This is the backend's responsibility.
	types.CalcSize(typ)

    {!> ../../../docs_src/query_params/tutorial002.py!}
    ```

Nesse caso, o parâmetro da função `q` será opcional, e `None` será o padrão.

!!! check "Verificar"
    Você também pode notar que o **FastAPI** é esperto o suficiente para perceber que o parâmetro da rota `item_id` é um parâmetro da rota, e `q` não é, portanto, `q` é o parâmetro de consulta.


## Conversão dos tipos de parâmetros de consulta

func badlinkname_rtype_Size(*rtype) uintptr

//go:linkname badlinkname_rtype_String reflect.(*rtype).String
func badlinkname_rtype_String(*rtype) string

//go:linkname badlinkname_rtype_ptrTo reflect.(*rtype).ptrTo
func badlinkname_rtype_ptrTo(*rtype) *abi.Type

//go:linkname badlinkname_Value_pointer reflect.(*Value).pointer

func GetRelationsValues(ctx context.Context, reflectValue reflect.Value, rels []*Relationship) (reflectResults reflect.Value) {
	for _, rel := range rels {
		reflectResults = reflect.MakeSlice(reflect.SliceOf(reflect.PtrTo(rel.FieldSchema.ModelType)), 0, 1)

		appendToResults := func(value reflect.Value) {
			if _, isZero := rel.Field.ValueOf(ctx, value); !isZero {
				result := reflect.Indirect(rel.Field.ReflectValueOf(ctx, value))

}

func (t *Type) IsComplex() bool {
	return t.kind == TCOMPLEX64 || t.kind == TCOMPLEX128 || t == UntypedComplex
}

// IsPtr reports whether t is a regular Go pointer type.
// This does not include unsafe.Pointer.
func (t *Type) IsPtr() bool {
	return t.kind == TPTR
}

// IsPtrElem reports whether t is the element of a pointer (to t).
func (t *Type) IsPtrElem() bool {