I'm sure that those cases are where you didn't want the mutation, but there are certainly performance and efficiency concerns that are directly satisfied by hav

I'm sure that those cases are where you didn't want the mutation, but there are certainly performance and efficiency concerns that are directly satisfied by having the sorting operate on the original array. This is especially so when considering that such operations can be occurring in the UI thread (and not a web worker) where excessive computation can interfere with the responsiveness of the application.