[PRE-RELEASE-0.4] [BUG] During encoding, leaf uses the identifier as the key for _builds, causing conflicts.

[jieguangzhou]

When the data contains different type_ids but the same identifier, it will result in errors.

from superduper import ObjectModel, Listener, Application, Document
model = ObjectModel(identifier="model1", object= lambda x: x)
listener = model.to_listener(identifier="model1", key="a", select=None)
application = Application(identifier="app", components=[listener])
encode_data = application.encode()
Document.decode(encode_data)

It's recommended to use "{type_id}:{identifier}" as the key in _builds