Perhaps they had Prolog in mind?

YAML is pretty good for readability, pretty awful for writability

Singapore is pretty bad as well

0,999… = 1

I use Microsoft Authenticator as well - I’m on iOS and it’s the only app I found that has Cloud Sync which comes in really handy when I change phones.

I believe iOS Passwords also supports OTPs but the UX of the passwords app always felt a bit clunky to me.