### Godot version

4.1.1

### System information

linux

### Issue description

The `"%+f"` format adds a `+` sign in front of positive numbers. If you try to format `-0.0`, it breaks and displays both a `+` and a `-`.

### Steps to reproduce

```gdscript
@tool
extends EditorScript

func _run() -> void:
    print("%+f" % -0.0)
```

### Minimal reproduction project

see above
if (length() == 0) {
		return p_right.length() != 0;
	}
	return is_str_less(get_data(), p_right.get_data());
}
bool Char::operator==(const Char &p_right) const {
	if (length() == 0) {
		
		return p_right.length() == 0;
	} else if (p_right.length() == 0) {
		
		return false;
	}
	return strcmp(ptr(), p_right.ptr()) == 0;
}
Char &Char::operator+=(char p_char) {
	const int lhs_len = length();
	resize(lhs_len + 2);
	char *dst = ptrw();
	dst[lhs_len] = p_char;
	dst[lhs_len + 1] = 0;
	return *this;
}
void Char::operator=(const char *p_cstr) {