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On Fri, Sep 11, 2015 at 10:00 PM, Random832 <random832@fastmail.com> wrote:

And if EST and EDT are, against all rationality, distinct tzinfo values,
then when exactly can fold ever actually be 1, and why is it needed?

No, fold is not needed in the case of fixed offset timezones. For an obvious reason: there are no folds or gaps in those.