[tz] [PATCH 2/4] Move obsolescent Americas entries to 'backward'.

[Paul Eggert]

On 08/27/13 01:18, Derick Rethans wrote:
> Are you leaving this longstanding policy of data stability behind now? 

Systematic support for pre-1970 timestamps has always been outside the
scope of the tz database, and as I recall it's been removed before
without problems.  The intent is that clock transitions before 1970
are recorded only to fill in the blank areas (on platforms with negative
time_t) for locations that differ since 1970.  So no, the policy
hasn't changed here.

For details, please see "Scope of the tz database" in the Theory file
<http://www.ietf.org/timezones/code/Theory>.