Pipe

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Picks two stack numbers and returns the OR comparison of their bits.

 0  0 | =  0
-1  0 | = -1
 0  1 | =  1
 1  1 | =  1
-1  1 | = -1
 0 -1 | = -1
-1 -1 | = -1

When one of the numbers is a power of 2, it adds both numbers.