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> On normal Lua (tested 5.2.2) it yields decent distribution:
>
> $ ./lua-5.2.2/src/lua math.lua |sort|uniq -c
> 5002 1
> 4998 2
>
> But on 5.1.5 on osx it's completely broken:
>
> $ ./lua-5.1.5/src/lua math.lua |sort|uniq -c
> 10000 1

I can confirm that, also what's weird:

-- math.lua
for i = 1, 10000 do
    math.randomseed(i)
    math.random(1,2)
    print(math.random(1,2))
end

$ lua math.lua |sort|uniq -c
5002 1
4998 2

LuaJIT does not exhibit that problem.