ArraySlice<T> (4 words) is larger than Slice<Array<T>> (3 words) and has worse code gen in many cases.
Is there any path to changing the return type of Array's unlabeled subscripts?
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No. This would be source- and binary-breaking. There is a path to improving the codegen for ArraySlice, however (especially if you report bugs for the bad cases you find)!
ArraySlice codegen is also a source of annoyance for me, by the way, but happily one that a number of folks are interested in fixing.
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