The docs for `results.subscribe(options)` indicate, that options is optional and can be provided or not provided. It is surprising then that providing undefined as an argument to subscribe results in the exception JS value must be of type 'object', got (undefined). Since this method is implemented in C++, it seems like it is too strict in checking the argument type and doesn't fallback to the no-argument case, like one would expect from a regular js function. Namely, I expect results.subscribe() to be equivalent to results.subscribe(undefined).