|> , and generate a "carry" into the next left column (or a new left column character if it's already the leftmost) when they wrap:
Addendum: And the new left column will be of the same "type" like the old leftmost.
# leftmost is ...
DB<14> $_="z"; print ++$_ # lowercase
DB<15> $_="z9"; print ++$_ # ...
DB<16> $_="zZ9"; print ++$_ # ...
DB<17> $_="Zz9"; print ++$_ # uppercase
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