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Switchback carryover washout: The first block inherits the last scheduled arm · case 04

Opening minutes of the experiment are washed out as if a switch had occurred.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Time is split into blocks of block_len minutes; block b runs schedule[b % len(schedule)]. Events [minute, value] in the first washout minutes of a block are excluded only when that block's arm differs from the previous block's arm (block 0 has no previous block). Return [mean A, mean B, excluded count] with None for an arm without events.

Why this case matters

Switchback experiments on marketplaces must discard carryover right after each switch.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
opening minutes are kept when the schedule ends on the other arm	`[null, 6.0, 1]`	`[4.0, 6.0, 0]`	Failed

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