Inconsistency in container.create_sender

For URL = "localhost:5672/examples"
Using the API in two different ways:

    def on_start(self, event):
        event.container.create_sender(URL)

Yields an attach with the following target:
[address="examples", durable=0, timeout=0, dynamic=false]

But this variation yields something different:

    def on_start(self, event):
        conn = event.container.connect(URL, heartbeat=8)
        event.container.create_sender(conn, URL)

yields:
[address="localhost:5672/examples", durable=0, timeout=0, dynamic=false]

The attach targets should be consistent across these examples. I believe the first example is the correct one.