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For up to 100 lots, computes the expiry date from manufacture/fill date + shelf life (days, weeks, months, years; month arithmetic clamps to month end) and from opened date + after-opening life, takes the earlier, and checks it against a caller asOf date and an optional minimum remaining days at receipt; flags a labelled expiry that disagrees with the computed one. The last day of life is the expiry date itself (usable through it). It does not know product-specific rules, storage-condition derating, or whether 'best before' is advisory; it never reads the clock.