### Godot version

4.2.dev3.official

### System information

Windows 10 - GLES3 (Compatibility)

### Issue description

When using the SpinBox node, it is possible for a user to input `NAN` into it (by clicking it and writing "NAN" as text).

I believe this should either be prevented (for example with an `allow_nan` property), or [documented](https://docs.godotengine.org/en/latest/classes/class_spinbox.html), as developers might not know that they should be checking the SpinBox's value against it.

![image](https://github.com/godotengine/godot/assets/141344817/ba1455e2-36b8-45f1-940d-32b9da92f1c4)


### Steps to reproduce

0. Create a new project.
1. Add a SpinBox node.
2. Run the project.
3. Click the SpinBox.
4. Type "NAN".
5. Press enter.

### Minimal reproduction project

[SpinBox NAN - MPR.zip](https://github.com/godotengine/godot/files/12448902/SpinBox.NAN.-.MPR.zip)

emit_signal(SNAME("changed"));
	queue_redraw();
}
void Range::Shared::emit_changed(const char *p_what) {
	for (Range *E : owners) {
		Range *r = E;
		if (!r->is_inside_tree()) {
			continue;
		}
		r->_changed_notify(p_what);
	}
}
void Range::Shared::redraw_owners() {
	for (Range *E : owners) {
		Range *r = E;
		if (!r->is_inside_tree()) {
			continue;
		}
		r->queue_redraw();
	}
}
void Range::set_value(double p_val) {