[5.3] base64_encode serialized objects before passing them to json_encode

[halaei]

In Queue::createPayload(), it is unsafe to json_encode(['command' => serialize(clone $job)]). Instead of throwing exception when json_encode is failed, we can do json_encode(['command64' => base_64(serialize(clone $job))]).

Related PR: #15284

@taylorotwell @themsaid Do you consider it as a breaking change? I tried to handle old jobs already in the queue by changing the array key from 'command' to 'command64', and handling both keys in CallQueuedHandler.

[halaei]

Can fix #15235

[GrahamCampbell]

Breaking change surely?

[taylorotwell]

People should be able to base64 their binary data themselves before putting it on the queue.

[halaei]

People usually find out about these sorts of things after many hours of debugging if that happen at all ;)