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local has_bit32,bit = pcall(require,'bit32')
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if has_bit32 then
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-- lua 5.2 / bit32 library
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bit.rol = bit.lrotate
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bit.ror = bit.rrotate
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return bit
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else
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-- luajit / lua 5.1 + luabitop
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return require'bit'
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end
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