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  local a, b, c = t[1]...


No, it's meant to turn "return (h(table,index))" into "return h(table,index)"


I'm sorry, but I still don't see why it is so important to
throw away any values here. Why is __index it in 2.4 defined to

   return (h(table,index))

instead of just

   return h(table,index)

which I'd find good uses for.