[tz] Stability versus correctness
eggert at cs.ucla.edu
Fri Jul 11 14:12:57 UTC 2014
Lester Caine wrote:
> I had thought there was an agreement that accurate historic data would
> be retained when the previous cull was proposed even though the 1970
> limit is used?
Yes, we want to keep data that we have a reasonable amount of confidence
in. The recent proposal attempted to discard data for which the only
source (Shanks) has proven to be very unreliable in the past, when
applied to out-of-the-way locations before 1970. (I clearly went too
far in that proposal, and plan to fix that soon.) The general rule of
thumb Shanks used seems to have been that when there was a gap in his
database, he made something up. The tz database does not need to
perpetuate this tradition everywhere.
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