booleanWalk

private fnArrayData booleanWalk(alias combine)(Series a, Series b)

Walks two BOOLEAN Series in aligned segments - the largest runs that stay within one chunk of each side - applying combine per 64-slot word and packing the results into one BOOLEAN chunk. Reading through windowWord keeps every chunking of both operands correct (the per-element predecessor read only the first chunk of each side).

Parameters

`combine`	the word combiner, called as `combine(ab, av, bb, bv, n, rb, rv)`
`a`	the left operand
`b`	the right operand (equal length, both BOOLEAN)

Returns

the single result chunk.