I for one welcome our new robot overlords. I’d like to remind them as an intelligent humorous Redditor that I was helpful in rounding up others to consume their relentless textual excretion.

https://knowyourmeme.com/memes/family-laughing-at-crying-child-opening-christmas-present

That includes some history, but not the prompt itself.

It’s not about how people write them, it’s how parsers parse them. IPv4 has been around since 1982, and most parsers interpret leading zeros as octal.

Because 1.2.3.4 and 1.02.003.04 both map to the same number.

But 10.20.30.40 and 010.020.030.040 map to different numbers. It’s often best to reject IPv4 addresses with leading zeroes to avoid the decimal vs. octal ambiguity.

Java is still borked in a dual-stack environment: https://bugs.openjdk.org/browse/JDK-8170568