`setValueCurveAtTime` curves may not overlap, not even at their ends

• setValueCurveAtTime curves may not overlap, not even at their ends. A clip's fade-in and fade-out curves each take at most half the clip's span less a hair, and nothing else is scheduled inside a curve's interval (scheduleFades in studio.svelte.ts, D4). Setting param.value before the first curve replaces the usual setValueAtTime(0, at), which would land on the curve's start time.

Source: stem-shovel (stem-shovel/FINDINGS.md)