Shrinking Swift Arrays

I’m really moving ahead with a new project (for tvOS!) and writing it entirely in Swift. On basically the second day of coding, I was really missing some NSArray/NSMutableArray functions from Swift Arrays, and after way more StackOverflow/Google time than it should have taken, here’s a version of removeObject that seems to compile:

Note also that the indexOfObject method on NSArray is replaced by the native indexOf method, so no need really to reimplement that.

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