lua's `and` and `or` reimplemented in lua

local function isTruthy(arg) --[[ could be shortened as
  if arg then
    return true
  else
    return false
  end ]]
  if arg == nil then
    return false
  elseif arg == false then -- Could have used or if we were not dong this to redefine things
    return false
  else
    return true
  end
end

local function Or(left, right)
  if isTruthy(left) then
    return left
  else
    return right
  end
end

local function And(left, right)
  if isTruthy(left) then
    return right
  else
    return left
  end
end