I decided to "scratch my own itch" and submitted a PR upstream.
https://github.com/shadow-maint/shadow/issues/219
** Bug watch added: github.com/shadow-maint/shadow/issues #219
https://github.com/shadow-maint/shadow/issues/219
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** Changed in: shadow (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1822501
Title:
chpasswd mishandles --root option
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