rf: Use list.copy() instead of list()

[effigies]

Very slight optimization, based on reviewing #135. list() will convert any iterable into a list, which incidentally performs a copy, while list.copy() is an explicit operation. This bypasses input detection logic, but I think more importantly makes the intent clearer. Static type checking can also distinguish these cases.

See also #135 (comment).

I'm not committed to this change, so if this strikes others as less clear or pointless optimization, feel free to close.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.00%. Comparing base (22dcd39) to head (06248e5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #148 +/- ## ======================================= Coverage 96.00% 96.00% ======================================= Files 5 5 Lines 250 250 ======================================= Hits 240 240 Misses 10 10 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[stefanv]

Thanks!