### 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
str = substr(p_from, p_to - p_from);
		}
	} else {
		return 0;
	}
	int c = 0;
	int idx = -1;
	do {
		idx = p_case_insensitive ? str.findn(p_string) : str.find(p_string);
		if (idx != -1) {
			str = str.substr(idx + slen, str.length() - slen);
			++c;
		}
	} while (idx != -1);
	return c;
}
int ::count(const  &p_string, int p_from, int p_to) const {
	return _count(p_string, p_from, p_to, false);
}
int ::countn(const  &p_string, int p_from, int p_to) const {
	return _count(p_string, p_from, p_to, true);
}
bool ::_base_is_subsequence_of(const  &p_string, bool case_insensitive) const {
	int len = length();
	if (len == 0) {
		// 
		return true;
	}
	if (len > p_string.length()) {
		return false;