Anchorage API reference
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    Variable INVENTORY_DRAIN_PROOFConst

    INVENTORY_DRAIN_PROOF: DrainProofContract = ...

    The rule that turns inventory readings into a decision.

    Stated in the index response, and repeated in the route doc, because every dangerous use of this surface is a use that skips it: one empty sweep is not a proof, and an empty sweep taken under migration-locked is not even a measurement of a drain.