Fix type-compatibilty check in GDScript

Objects and PoolArrays are properly tested for conversion.

modules/gdscript/gdscript_parser.cpp

@@ -5746,18 +5746,23 @@ bool GDScriptParser::_is_type_compatible(const DataType &p_container, const Data
 	if (p_container.kind == DataType::BUILTIN && p_expression.kind == DataType::BUILTIN) {
 		bool valid = p_container.builtin_type == p_expression.builtin_type;
 		if (p_allow_implicit_conversion) {
-			valid = valid || (p_container.builtin_type == Variant::INT && p_expression.builtin_type == Variant::REAL);
-			valid = valid || (p_container.builtin_type == Variant::REAL && p_expression.builtin_type == Variant::INT);
-			valid = valid || (p_container.builtin_type == Variant::STRING && p_expression.builtin_type == Variant::NODE_PATH);
-			valid = valid || (p_container.builtin_type == Variant::NODE_PATH && p_expression.builtin_type == Variant::STRING);
-			valid = valid || (p_container.builtin_type == Variant::BOOL && p_expression.builtin_type == Variant::REAL);
-			valid = valid || (p_container.builtin_type == Variant::BOOL && p_expression.builtin_type == Variant::INT);
-			valid = valid || (p_container.builtin_type == Variant::INT && p_expression.builtin_type == Variant::BOOL);
-			valid = valid || (p_container.builtin_type == Variant::REAL && p_expression.builtin_type == Variant::BOOL);
+			valid = valid || Variant::can_convert_strict(p_expression.builtin_type, p_container.builtin_type);
 		}
 		return valid;
 	}
 
+	if (p_container.kind == DataType::BUILTIN && p_container.builtin_type == Variant::OBJECT) {
+		// Object built-in is a special case, it's compatible with any object and with null
+		if (p_expression.kind == DataType::BUILTIN && p_expression.builtin_type == Variant::NIL) {
+			return true;
+		}
+		if (p_expression.kind == DataType::BUILTIN) {
+			return false;
+		}
+		// If it's not a built-in, must be an object
+		return true;
+	}
+
 	if (p_container.kind == DataType::BUILTIN || (p_expression.kind == DataType::BUILTIN && p_expression.builtin_type != Variant::NIL)) {
 		// Can't mix built-ins with objects
 		return false;