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As discussed here. This currently doesn't work at all since message are getting re-ordered in flight. Never caught since no unit test was running with a set. I can't imagine anyone is actually using this in production since it just doesn't work. Only a deprecation instead of outright removal is the fact it has existed broken for 9 years.

Also removed the UserList checks since isinstance() checks for subclasses and UserList is a subclass of Sequence so it was never being triggered.

Is this user-facing behavior change?

Yes, users cannot pass in sets anymore.

Did you use Generative AI?

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Signed-off-by: Michael Carlstrom <[email protected]>
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Cc @christophebedard since we had the discussion in ros2doc

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