OnSched API 3.4.1 — allocation mode availability (weekly schedule)

Availability — allocation mode

• Weekly schedule merge — Prevents a spurious full-day unavailability block (UTC 00:00–23:59) from merging with partial “closed outside open hours” blocks on the same calendar day, which could erase operating-hour gaps and return no slots (or the wrong slot set) when a SingleAllocation narrows the bookable window.
• service_allocation_days — Avoids treating every date in a weekly allocation’s calendar range as a “covered” service day; that over-approximation could stop the “outside allocation” full-day guard from running and incorrectly open weekdays that the allocation pattern does not cover.