def flat_map(self, func):
        return self._transform(transformations.flat_map_t(func))
Checks if placeholder has reached it's global plugin limit,
dataset/ETHPy150Open EntilZha/PyFunctional/functional/pipeline.py/Sequence.flat_map--crossover with--dataset/ETHPy150Open divio/django-cms/cms/utils/plugins.py/has_reached_plugin_limit