PSA: You can safely refer to those long "commit-ish" identifiers using just the first 7 or 8 chars (eg `88113a64`) without real risk of collision. Let alone in examples / gists!
I had a collision the other day on a mediums-sized when using a 6 character hash and was surprised. Git let me know and told me which objects collided.
According to [1] using 3 letters you'd need at least 72 commits to have at least 50% chance to observe a clash. Using 6 letters you'd need at least 3977 commits, lol.
[1] https://en.wikipedia.org/wiki/Birthday_problem#The_generaliz...
I use six character hashes, I don’t recall that I’ve had a collision yet. But I guess I’m “due”. :-)