I wrote:
> It looks like we have some of the variants marked stable already for
> their dependence on TimeZone, but the dependence on lc_messages is new.
Actually, now that I look at it, *most* of the variants of to_char,
to_number, and friends have been broken on this score since day one.
There's been a dependency on LC_NUMERIC for the numeric variants all
along, but they're marked immutable :-(
regards, tom lane