merge method

Implementation

@override
FlyRadiusToken merge(FlyToken<double> other) {
  if (other is! FlyRadiusToken) return this;

  return copyWith(
    xs: other.xs,
    sm: other.sm,
    md: other.md,
    lg: other.lg,
    xl: other.xl,
    xl2: other.xl2,
    xl3: other.xl3,
    xl4: other.xl4,
    extras: {...extras, ...other.extras},
  );
}