Would this request fit in the remaining quota, given a snapshot and pending reservations? (snapshot-

Overview

Computes available quota from a caller-supplied snapshot (limit, used, reserved) minus the unexpired pending reservations and says whether a requested amount fits. This is a read of the numbers you supply as of snapshotAt: it reserves nothing, so concurrent consumers can still use the quota before you do, and every response says so. A stale snapshot gives unknown, not pass; a window that ended at or before asOf gives unknown even when the request does not fit, because the num

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