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Another case many integer parsing functions get wrong is that they interpret a leading 0 as an octal indicator.

That should be opt-in via a flag, if it needs to be supported at all. Unix file permissions are the only deliberate use of octal I've ever seen.

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It used to be much more common. In the 70s there was a lot of collective hesitance to use hex with its strange letter digits. Octal was the compact representation of choice.

Also, some very old computers had 36-bit words. Word sizes on modern computers are virtually always powers of 2, but it hasn't always been that way.

And octal is more convenient for output via 7-segment LEDs and for input via numeric keypads.

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