JSON is slightly worse than you describe - the JSON language doesn’t restrict you to 64bit floats, but most implementations do as you describe. On the other hand, the JSON language doesn’t support NaNs or infinities, so the union of language and implementation means that in practice JSON is strictly weaker than IEEE 754.
If you count by threes, the ones place is unique until you pass each multiple of 30 - 3, 6, 9, _8, _1, _4, where was I? I hadn’t made it to 30, ends with a 4, must be 24. 27, 30, 33, _6…
Serves as a sort of checksum, as long as you know roughly how many you have and just the last digit.
I find them vital for side projects - especially if they get set aside for a week/month/year, I sometimes will lose track of assumptions I’ve made or use cases for apis that tests tend to expose.
Sure you can encode all of that as comments, but unless you reread each file when you return from a break, you can’t always trace those thoughts and see where they lead. On the other hand if you “find all references” in your ide or change some implementation so that a test breaks, past-you can save the day with that extra information about what they intended at the time.
Another anecdote for your collection: my father fell off a ladder last year - not far enough to sustain any injury, but far enough to catch his ring slightly in trying to regain his balance. Finger ended up swelling enough that the ring was a problem, ended up having to be cut off.
I wouldn’t have imagined that a fall off of the second step of a ladder could result in the destruction of a 40 year old wedding ring either, but here we are!
Destruction? My wife crushed hers onto her finger in a cycle crash. It was across the park from our house. Her finger swelled terribly. I put her in the car and drove her to the fire station just down the road where they cut it off. I learned there was a special tool for this! I sent the cut ring to a jeweller friend of a friend... who melted it down and cast it into a slightly smaller ring! Edit: in another post there isa video where someone solders up a cut ring. My wife's ring was much more damaged by the crash than the rings in the video, hence the melt
