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> But de Morganising makes bor use four calls to band (three via bnot), so
> to avoid that I kept bor primitive.

You forgot the other "bunny" (whatever that means ;-):

>    not A = -A - 1     (Paul Hsieh wrote that)

So, you have

function bor (a,b) return -band(-a-1, -b-1)-1 end

It's only one call!

-- Roberto