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Switchback carryover washout: Events are assigned to the nearest block · case 03

Events late in a block are credited to the next block's arm.

Member previewVariant 3 · 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
block boundary minute starts the new block	`[null, 4.0, 1]`	`[3.0, 4.0, 0]`	Failed

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