In my experience, the expression `value |= other` is a common idiom across
programming languages to provide a default for `value` if it is "unset".
Interesting. Can you point to specific examples of this? In what other languages have you seen this? (Not that it would make us change PEP 584, but if this appears common we could probably warn about it prominently in docs and tutorials.)
I was thinking that bash scripting might be an example, but I double checked, and that's spelled 'VAR="${$VAR:-default value}" '
make has 'VAR ?= "default value"'
C# uses "??=" for null coalescence on assignment.
So I've also never come across "|=" being used for this purpose.
Cheers,
Nick.