payload != body in middleware/listener args

[seratch]

Currently, payload in middleware/listener args is an alias to body. This is not compatible with Bolt JS.

Reproducible in:

@app.action("action-id")
def handle_action(body, payload, action, ack):
    assert body != payload
    assert payload == action
    ack()

The slack_bolt version

The latest revision

Python runtime version

Any

OS info

Any

Steps to reproduce:

Run the above snippet in your Bolt app.

Expected result:

200 OK

Actual result:

500 Internal Server Error

Requirements

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