As shown in image below, what do _S@map and _T@map mean?
Additional information:
Looking at multiprocessing.Pool.map definition there is not type hints, so the types above must be automatically generated by Pylance, which is the language server I was using
def map(self, func, iterable, chunksize=None):
'''
Apply `func` to each element in `iterable`, collecting the results
in a list that is returned.
'''
return self._map_async(func, iterable, mapstar, chunksize).get()