[$] Facing the Git commit-ID collision catastrophe

Commits in the Git source-code management system are identified by theSHA-1 hash of their contents - though the specific hash may change someday. The full hash is a160-bit quantity, normally written as a 40-character hexadecimal string.While those strings are convenient for computers to work with, humans findthem to be a bit unwieldy, so it is common to abbreviate the hash values toshorter strings. Geert Uytterhoeven recently proposedincreasing the length of those abbreviated hashes as used in the kernelcommunity, but the problem he was working to solve may not be as urgent asit seems.