When the tag default is used in a bool field huma is ignoring the sent value

[robsonpeixoto]

{
	Name: "request-body-defaults-respect-input",
	Register: func(t *testing.T, api huma.API) {
		huma.Register(api, huma.Operation{
			Method: http.MethodPut,
			Path:   "/body",
		}, func(ctx context.Context, input *struct {
			Body struct {
				// Test defaults for primitive types.
				Name  string `json:"name,omitempty" default:"Huma"`
				Count int    `json:"count,omitempty" default:"5"`
				// Test defaults for slices of primitives.
				Tags    []string `json:"tags,omitempty" default:"foo, bar"`
				Numbers []int    `json:"numbers,omitempty" default:"[1, 2, 3]"`
				// Test defaults for fields within slices of structs.
				Items []struct {
					ID       int  `json:"id"`
					Verified bool `json:"verified,omitempty" default:"true"`
				} `json:"items,omitempty"`
			}
		},
		) (*struct{}, error) {
			assert.Equal(t, "Huma", input.Body.Name)
			assert.Equal(t, 5, input.Body.Count)
			assert.Equal(t, []string{"foo", "bar"}, input.Body.Tags)
			assert.Equal(t, []int{1, 2, 3}, input.Body.Numbers)
			assert.Equal(t, 1, input.Body.Items[0].ID)
			assert.False(t, input.Body.Items[0].Verified)
			return nil, nil
		})
	},
	Method: http.MethodPut,
	URL:    "/body",
	Body:   `{"items": [{"id": 1, "verified": false}]}`,
},

For the body {"items": [{"id": 1, "verified": false}]}, the field Verified should be false, but the default:"true" is forcing the value to true.

[barata0]

It is not only with bool fields.
But every field that responds true to IsZero() (eg. Numeric Zero count=0) will be overridden by defaults.
This PR fixes this

[danielgtaylor]

Fixed in #633.