Paho 2.0.0 mqtt Client can not publish bytearray payload

[marko92milinkovic]

Bug Description

Paho 2.0.0 mqtt Client can not publish bytearray payload

Reproduction

Calling paho.mqtt.client.Client.publish with payload as bytearray with qos = 1.
The publish method internally calls _encode_payload:

....
   if not isinstance(payload, (bytes, bytearray)):
       raise TypeError(
           "payload must be a string, bytearray, int, float or None."
       )

   return payload

Then it calls _send_publish and the code blows up inside it:
if payload and not isinstance(payload, bytes): raise TypeError('payload must be bytes if set')

Environment

• Python version: 3.10
• Library version: 2.0.0
• Operating system (including version): MacOS 13.6.6
• MQTT server (name, version, configuration, hosting details): mosquitto 2.0.11

Logs

client.publish(message.topic, message.payload, 1)
File "/usr/local/lib/python3.10/site-packages/paho/mqtt/client.py", line 1798, in publish
rc = self._send_publish(message.mid, topic_bytes, message.payload, message.qos, message.retain,
File "/usr/local/lib/python3.10/site-packages/paho/mqtt/client.py", line 3377, in _send_publish
raise TypeError('payload must be bytes if set')