I'm totally aware of that. I'm just confused because in idiomatic Python, list copies without a map, filter, or reduce operation are very rare, so a list copy is usually replaced with a list comprehension or iterative loop of some sort.

For example, in Bravo, there are exactly eight list copies, all in contributed code which I didn't write, and another six in Exocet, which I also didn't write. The ones in Exocet are probably required, but the others are from code that was written without forethought.