raise TypeError when function returns object-like results

[michael2015tse]

This roll_apply raises TypeError: must be real number, not str when my customized function returns str / list or other object-like results. Because here it is: ndarray[float64_t] output

pandas/pandas/_libs/window/aggregations.pyx

Line 1396 in 0691c5c

ndarray[float64_t] output, counts