Pre-connect Realtime manager.send crashes on Omit in dict events

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
python
Domain
api

Research direction

Start with AsyncRealtimeConnectionManager.send() and RealtimeConnectionManager.send(), then compare their json.dumps(event) path with post-connect connection.send() and maybe_transform(). Reproduce the Omit payload shown in the issue and add the mentioned regression test; done means pre-connect sends no longer raises the serialization error.

Written by the indexing model from the issue text.

Description

AsyncRealtimeConnectionManager.send() / RealtimeConnectionManager.send() call json.dumps(event) on dict payloads, but post-connect connection.send() uses maybe_transform() which strips Omit/NotGiven.

Repro:

manager = client.realtime.connect(model="gpt-4o-realtime-preview")
manager.send({"type": "response.cancel", "event_id": omit})
# TypeError: Object of type Omit is not JSON serializable

PR incoming with regression test.

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