toOffsetLimit

Converts backward pagination arguments to offset/limit.

• last determines the page size (defaults to defaultPageSize).

• before cursor encodes the index of the first item on the next page; the offset and limit are computed to return the last items ending just before that position. Both are clamped so the window never extends before index 0.

• If before is absent, OffsetLimit.backwards is set to true and offset is 0, signalling viaduct.api.internal.ConnectionBuilder.fromList to take from the tail of the full list rather than the head.