BUG: Fix unconverting of long strings from HDF (GH6166)
CLN: leftover rebasing from 405018c
Merge pull request #6823 from cpcloud/vbench-git-fix

CLN: leftover rebasing from 405018cf
Merge pull request #6821 from jreback/unconvert2

BUG: Fix unconverting of long strings from HDF (GH6166)