Data is not unserialized

When we create a job we can use 'data' to set some data in to it, so what I saw is when initially save data into the database it serialize and save, and since there is no any unserialization to the 'data' it keep serializing when job schedules starts.

So ultimately you will get a big serialize array, so ideal solution would be unserialize and re-write $job object before process.

Patch is attached.