op * t, b.right * t, b.bottom * t);
  if (b == null) {
    final double k = 1.0 - t;
    return Rect.fromLTRB(a.left * k, a.top * k, a.right * k, a.bottom * k);
  }
  return Rect.fromLTRB(
    lerpDouble(a.left, b.left, t),
    lerpDouble(a.top, b.top, t),
    lerpDouble(a.right, b.right, t),
    lerpDouble(a.bottom, b.bottom, t),
  );
}</code></pre>
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