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Fix slight perf hit when checking validity bitmap (#176)
Fixes #131. Dip me in mustard and call me a hotdog, cuz I can't tell how/why `divrem(i - 1, 8) .+ (1, 1)` ends up being ~30% faster than `fldmod1(i, 8)`. It'd probably be worth looking into it more, but it works for now. The divrem code is @ExpandingMan 's code from his arrow/feather code.
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