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Why Lua 5.1 allows to define local variables more than once and not throws error?
local a = 1
local a = a or 2
print(a) -- will print "1"

function f(a)
  -- we don't see it, but variable `a` is already defined in function's scope
  -- and now we still can define local variable with same name `a`
  local a = a or 4
f(3) -- will print "3"