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Marc-André Bombeck
191221cba6
The same-UTC-day DST case drives the worst cancellation in the closed-form slope at large epoch-day x; Postgres REGR_SLOPE is mean-centred and keeps the digits we lose. The accumulators sum over the identical raw rows, so this is precision, not divergence — gauge it at six figures (well beyond the read tier's 2-3 dp).