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  • \$\begingroup\$ Can save 5 by special-casing the empty input to pad with z0Z \$\endgroup\$ Commented Aug 1, 2022 at 2:30
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    \$\begingroup\$ @UnrelatedString I was trying to use z0Z initially but gave up, nice use of tail's default behaviour there! Will update to use soon, thanks! \$\endgroup\$ Commented Aug 1, 2022 at 10:41