def _get_field_value(self, full_field_name):
        """Gets the field value, optionally casting it using the cached field mapping"""
        field_value = self._fields_dict[full_field_name]
        return ek_field_mapping.MAPPING.cast_field_value(self._layer_name, full_field_name, field_value)
Gets the field value, optionally casting it using the cached field mapping
src/pyshark/packet/layers/ek_layer.py