[xurshudyan]

Passing a collection as the range to whereBetween() on a collection doesn't work. It uses reset() and end() on the object, so the bounds end up being the internal items array and false, and you just get an empty result without any error:

$range = $request->collect('price'); // [10, 50]

Product::whereBetween('price', $range)->get(); // works
$products->whereBetween('price', $range);      // always empty
$products->whereNotBetween('price', $range);   // returns everything

The docblock already says Arrayable|iterable, and whereIn() does the same getArrayableItems() call.