Marcel Moolenaar b2ce196ca1 o make sure the boundary is a power of 2, when not zero.
o   don't convert 0 to ~0 just so that we can use MIN. ~0 is not a
    valid boundary. Introduce BNDRY_MIN that deals with 0 values
    that mean no boundary.
2015-07-26 16:39:37 +00:00
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