Type casting problem

[lua-rocks]

Hello! I just started using your plugin and I have enough experience in emmylua comments, but I don't know anything about your add-ons yet. Can you help me please to fix just one error here. I have no idea how to do that, it looks like a bug to me:

---@vararg table|function @ `__index` set
---@return table|function... combined `__index`
local function mix_index(...)
  local args_num = select("#", ...)
  if args_num < 2 then return ... end

  local indexes = {} ---@type function[]
  local last = 0
  for i = 1, args_num do
    local index = select(i, ...)
    if index then
      local t = type(index)
      last = last + 1
      if t == 'table' then
        indexes[last] = function(_, key)
          if key == nil then return { index } end
          return index[key] -- <<< I DON'T KNOW HOW TO CAST THIS
        end
      elseif t == 'function' then
        indexes[last] = --[[---@type function]] index
      end
    end
  end

  return function (_, key)
    if key == nil then return indexes end
    for _, index in ipairs(indexes) do
      local result = index(_, key)
      if result ~= nil then return result end
    end
  end
end

return mix_index