#golang pop quiz: why does this checksum function return an empty array? https://play.golang.org/p/vssR9ISpG_
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Subslice vs the actual slice
Elaborate. Appending to a [:0] subslice is a common pattern; why doesn't it work here?
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Sum isn't going to grow the slice (which isn't really a subslice problem but the subslice feels superfluous either way)
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