code: def from_mongo(cls, doc):
  		
  		
  		if doc is None:  # To support simplified iterative use, None should return None.
  			return None
  		
  		if isinstance(doc, Document):  # No need to perform processing on existing Document instances.
  			return doc
  		
  		if cls.__type_store__ and cls.__type_store__ in doc:  # Instantiate specific class mentioned in the data.
  			cls = load(doc[cls.__type_store__], 'marrow.mongo.document')
  		
  		# Prepare a new instance in such a way that changes to the instance will be reflected in the originating doc.
  		instance = cls(_prepare_defaults=False)  # Construct an instance, but delay default value processing.
  		instance.__data__ = doc  # I am Popeye of Borg (pattern); you will be askimilgrated.
  		instance._prepare_defaults()  # pylint:disable=protected-access -- deferred default value processing.
  		
  		return instance
docs: Convert data coming in from the MongoDB wire driver into a Document instance.