Also generate ROS overload for vararg methods

modules/mono/editor/bindings_generator.cpp

@@ -2686,6 +2686,10 @@ Error BindingsGenerator::_generate_cs_method(const BindingsGenerator::TypeInterf
 				break;
 			}
 		}
+
+		if(p_imethod.is_vararg){
+			has_span_argument = true;
+		}
 	}
 
 	if (p_use_span && has_span_argument) {
@@ -4593,13 +4597,14 @@ void BindingsGenerator::_populate_builtin_type_interfaces() {
 	itype = TypeInterface();
 	itype.name = "VarArg";
 	itype.cname = itype.name;
-	itype.proxy_name = "Variant[]";
+	itype.proxy_name = "ReadOnlySpan<Variant>";
 	itype.cs_type = "params Variant[]";
-	itype.cs_in_expr = "%0 ?? Array.Empty<Variant>()";
+	itype.cs_in_expr = "%0";
 	// c_type, c_in and c_arg_in are hard-coded in the generator.
 	// c_out and c_type_out are not applicable to VarArg.
 	itype.c_arg_in = "&%s_in";
-	itype.c_type_in = "Variant[]";
+	itype.c_type_in = "ReadOnlySpan<Variant>"; 
+	itype.is_span_compatible = true;
 	builtin_types.insert(itype.cname, itype);
 
 #define INSERT_ARRAY_FULL(m_name, m_type, m_managed_type, m_proxy_t)                \