### Godot version

v4.0.rc1.official [8843d9ad3]

### System information

Lubuntu

### Issue description

You can't use + or += to mutate typed arrays.

It seems to be not correctly getting the type information from the second operand.

An erudite poster on the discord puts it differently:
> it's more like operator + doesn't retain Array typing
> the syntax for Array Concatenation via operators, but the idea gets across i think


The error you see is:
```Trying to assign an array of type "Array" to a variable of type "Array[int]".```


### Steps to reproduce

```
	var Alice: Array[int] = [1,2,3]
	var Bob: Array[int] = [4,5,6]
	Alice += Bob
```
This will crash with the above error message.

### Minimal reproduction project

[plus_syntax_broken_demo_project.zip](https://github.com/godotengine/godot/files/10694514/plus_syntax_broken_demo_project.zip)

const Dictionary &b = *VariantGetInternalPtr<Dictionary>::get_ptr(right);
		*VariantGetInternalPtr<bool>::get_ptr(r_ret) = b.has(Variant());
	}
	static void ptr_evaluate(const void *left, const void *right, void *r_ret) {
		PtrToArg<bool>::encode(PtrToArg<Dictionary>::convert(right).has(Variant()), r_ret);
	}
	static Variant::Type get_return_type() { return Variant::BOOL; }
};
class OperatorEvaluatorInDictionaryHasObject {
public:
	static void evaluate(const Variant &p_left, const Variant &p_right, Variant *r_ret, bool &r_valid) {
		const Dictionary &b = *VariantGetInternalPtr<Dictionary>::get_ptr(&p_right);
		*r_ret = b.has(p_left);
		r_valid = true;
	}
	static inline void validated_evaluate(const Variant *left, const Variant *right, Variant *r_ret) {
		const Dictionary &b = *VariantGetInternalPtr<Dictionary>::get_ptr(right);
		*VariantGetInternalPtr<bool>::get_ptr(r_ret) = b.has(*left);
	}
	static void ptr_evaluate(const void *left, const void *right, void *r_ret) {
		PtrToArg<bool>::encode(PtrToArg<Dictionary>::convert(right).has(PtrToArg<Object *>::convert(left)), r_ret);
	}
	static Variant::Type get_return_type() { return Variant::BOOL; }
};
class OperatorEvaluatorObjectHasPropertyString {
public:
	static void evaluate(const Variant &p_left, const Variant &p_right, Variant *r_ret, bool &r_valid) {