Adoption feedback

[Bobronium]

If you're using or evaluating copium, drop a comment with your experience.

Even if you're not planning to adopt copium in your projects soon, your feedback might help others decide.

Use this template or write free-form:

### Use case
<!-- What are you deepcopying and where? (task queue, API server, training loop, CLI tool, PyPI library, code snippet, etc.) -->

### Usage pattern
<!-- `copium[autopatch]`, `copium.patch.enable()` or manual `from copium import deepcopy`? -->

### What happened
<!-- Test suite pass/fail? Crashes? Warnings? Performance delta? "Everything worked" counts. -->