Better handling of at in push_bulk

[BuonOmo]

Ruby version: X
Sidekiq version: 6.X

The current (>= 6) version of Sidekiq::Client.push_bulk accepts an at that could be an array of numeric timestamps. However, if the size of that array doesn't match the number of jobs, this will throw a redis error:

    # test/test_client.rb
    it 'cannot handle at with different size' do
      at = Time.new(2020, 1, 1).to_f
      first_jid, second_jid = Sidekiq::Client.push_bulk('class' => QueuedWorker, 'args' => [[1], [2]], 'at' => [at]) # will raise +Redis::CommandError: ERR value is not a valid float+
    end

I'd be glad to fix this one, but there are many way to do so... Here are the solutions I had in mind:

1. raise properly an ArgumentError if size mismatch
2. use the last at item as default when at is smaller:

   Sidekiq::Client.push_bulk('class' => K, 'args' => [[1], [2]], 'at' => [at])
   # would be like
   Sidekiq::Client.push_bulk('class' => K, 'args' => [[1], [2]], 'at' => [at, at])

[mperham]

1 would be my choice.

[BuonOmo]

Here it is then 🙂