Support Collection with Queue::bulk

[mzur]

The Queue::bulk() method does not work with an Illuminate\Support\Collection as first argument. In bulk(), the first argument is cast to an array but the Collection behaves in an unexpected way here:

$c = collect([123]);
$c->toArray();
// [
//   123,
// ]
(array) $c;
// [
//   "\0*\0items" => [
//     123,
//   ],
//   "\0*\0escapeWhenCastingToString" => false,
// ]

Jobs that are created with a $collection->map(), for example, will fail with a cryptic error.

I propose to implement explicit support for Collection in Queue::bulk().

Also, the QueueFake does not cast the first argument to an array, which makes the above issue hard to detect in tests.

I propose to implement array casting (and support for Collection) in the QueueFake to make this behavior consistent. What do you think?