Five in-tree copies of the canary tag regex disagreed: darwin.py demanded 14 digits,
release_channels/r2 prune accepted any/8, the rest 8-or-14. r2.canary_doomed_keys
compared an 8-digit cutoff against the first 8 chars of a captured \d{8}, so a 14-digit
key matched on its date prefix by accident of regex greediness; it now slices the
suffix explicitly like scripts/release.py does. scripts/termux/deb_version.py keeps
its copy on purpose (runs under bare python3 in a workflow shell) and its test pins
it to the canonical one.
ad53be7826