old_contents: from model import BaseModel
  
  from feature import Feature, JSONFeature, TextFeature, CompressedFeature, \
      PickleFeature
  
  from extractor import Node, Graph, Aggregator, NotEnoughData
  
  from bytestream import ByteStream, ByteStreamFeature
  
  from data import \
      IdProvider, UuidProvider, UserSpecifiedIdProvider, KeyBuilder \
      , StringDelimitedKeyBuilder, Database \
      , FileSystemDatabase, InMemoryDatabase
  
  from datawriter import DataWriter
  
  from nmpy import StreamingNumpyDecoder, NumpyMetaData
  
  from database_iterator import DatabaseIterator
  
  from encoder import IdentityEncoder
  
  from decoder import Decoder
  
  from lmdbstore import LmdbDatabase
  
  from persistence import PersistenceSettings
  
new_contents: from model import BaseModel
  
  from feature import Feature, JSONFeature, TextFeature, CompressedFeature, \
      PickleFeature
  
  from extractor import Node, Graph, Aggregator, NotEnoughData
  
  from bytestream import ByteStream, ByteStreamFeature
  
  from data import \
      IdProvider, UuidProvider, UserSpecifiedIdProvider, KeyBuilder \
      , StringDelimitedKeyBuilder, Database \
      , FileSystemDatabase, InMemoryDatabase
  
  from datawriter import DataWriter
  
  from nmpy import StreamingNumpyDecoder, NumpyMetaData, NumpyFeature
  
  from database_iterator import DatabaseIterator
  
  from encoder import IdentityEncoder
  
  from decoder import Decoder
  
  from lmdbstore import LmdbDatabase
  
  from persistence import PersistenceSettings
  
subject: Add NumpyFeature to top-level exports