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Vector CASE evaluates THEN errors on ELSE-selected lanes · case 04

Vector CASE evaluates THEN errors on ELSE-selected lanes.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Evaluate CASE over [condition,then-value,then-error,else-value,else-error] rows. Only True chooses THEN; False and None choose ELSE. Unchosen errors are not evaluated. Chosen errors become ERROR:<label>; a chosen null value remains None. Return one result per input lane.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
skip erroneous then	`["ERROR:T"]`	`[5]`	Failed

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