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           

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[stefanv]

Thanks!