add bitwiden & bitnarrow to header
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@ -195,6 +195,9 @@ void bit_negatePtr(u64* rp, u64* xp, usz count); // count is number of u64-s
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B widenBitArr(B x, ur axis); // consumes x, assumes bitarr; returns some array with cell size padded to the nearest of 8,16,32,64 if ≤64 bits, or a multiple of 64 bits otherwise
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B narrowWidenedBitArr(B x, ur axis, ur cr, usz* csh); // consumes x.val; undoes widenBitArr, overriding shape past axis to cr↑csh
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void bitnarrow(void* rp, ux rcsz, void* xp, ux xcsz, ux cam);
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void bitwiden(void* rp, ux rcsz, void* xp, ux xcsz, ux cam);
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Arr* cpyWithShape(B x); // consumes; returns new array with the same shape as x; to allocate a new shape in its place, the previous one needs to be freed, rank set to 1, and then shape & rank set to the new ones
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Arr* emptyArr(B x, ur xr); // doesn't consume; returns an empty array with the same fill as x; if xr>1, shape must be set
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NOINLINE Arr* emptyWithFill(B fill); // consumes; returns new array with unset shape and the specified fill
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