Fixes integer overflows in index computation when indexes approach numeric_limits<OffsetT>::max()
#1419
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note: this PR replaces #1355. #1355 was automatically closed because the targeted base branch was merged and I didn't manage to reopen the PR
Description
Closes #1334
I had tried various ways to prevent integer overflows, most of which were degrading performance for small types by as much as 20%. This fix keeps performance changes within noise.
Checklist