On 09.05.25 21:50, Robert Haas wrote:
> I always struggle a bit to remember our policy on these issues -- to
> the best of my knowledge, we haven't documented it anywhere, and I
> think we probably should. I believe the way it works is that whenever
> a function depends on the operating system's timestamp or locale
> definitions, we decide it has to be stable, not immutable. We don't
> expect those things to be updated very often, but we know sometimes
> they do get updated.
I don't understand how this discussion got to the conclusion that
functions that depend on the locale cannot be immutable. Note that the
top-level functions lower, upper, and initcap themselves are immutable.