FA-81462 / MIDI event timing / Member archive

Absolute events to delta-time serialisation: note-on emitted before simultaneous note-off · case 02

A repeated note whose off and next on share a tick is emitted on-then-off, so a receiver cuts the new note immediately.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input a list of [tick, kind, note] with kind on or off in any order. Emit events sorted by tick; at equal ticks note-offs precede note-ons, and otherwise input order is kept. Each output is [delta from the previous emitted event (the first from tick 0), kind, note]. A negative tick returns None.

Why this case matters

MIDI sequencers, file readers and synth drivers depend on exact event ordering and tick/time arithmetic.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
oracle 0	`[[0, "on", 60], [10, "on", 62], [0, "off", 60]]`	`[[0, "on", 60], [10, "off", 60], [0, "on", 62]]`	Failed

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