send(suppress=True) causes TypeError: Type is not JSON serializable: flag_value

[honzajavorek]

Summary

I upgraded to v2.2.1 and edited my code to use .send(suppress=True) instead of a combo of send & edit(suppress=True). Such change prompted the exception described in the title. I think addition of suppress to sending isn't working correctly.

Reproduction Steps

1. Get a channel (in my case it's a thread, but I doubt that would be much different?)
2. Have a working code as follows:

   message = await channel.send(content='blah blah https://junior.guru/handbook/cv/')
   await message.edit(suppress=True)

3. Upgrade to v2.2.1 or v2.2.2 (doesn't matter) and rewrite code to following:

   await channel.send(content='blah blah https://junior.guru/handbook/cv/', suppress=True)

4. Get this exception:

   ...
       await thread.send(content=content, suppress=True)
   File "/Users/honza/Library/Caches/pypoetry/virtualenvs/juniorguru-Lgaxwd2n-py3.10/lib/python3.10/site-packages/discord/abc.py", line 1580, in send
       data = await state.http.send_message(
   File "/Users/honza/Library/Caches/pypoetry/virtualenvs/juniorguru-Lgaxwd2n-py3.10/lib/python3.10/site-packages/discord/http.py", line 240, in request
       kwargs["data"] = utils._to_json(kwargs.pop("json"))
   File "/Users/honza/Library/Caches/pypoetry/virtualenvs/juniorguru-Lgaxwd2n-py3.10/lib/python3.10/site-packages/discord/utils.py", line 599, in _to_json
       return orjson.dumps(obj).decode("utf-8")
   TypeError: Type is not JSON serializable: flag_value
   

Minimal Reproducible Code

See reproduction steps.

Expected Results

The code works in the same way as the combo of sending & editing with the suppress keyword argument, saving one API call on its way.

Actual Results

Code crashes.

Intents

guilds, members, message_content

System Information

• Python v3.10.6-final
• py-cord v2.2.2-final
• aiohttp v3.8.3
• system info: Darwin 21.6.0 Darwin Kernel Version 21.6.0: Mon Aug 22 20:20:05 PDT 2022; root:xnu-8020.140.49~2/RELEASE_ARM64_T8101

(but getting the same error on CI with Linux)

Checklist

• I have searched the open issues for duplicates.
• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.

Additional Context

No response