v1.2.1

• Add new Interface Flow\AsyncHandlerInterface to control the Event::SYNC step when processing an IP
  • Add Flow\AsyncHandler\AsyncHandler the default handler when Event::SYNC is dispatched
  • Add Batch IP with Flow\AsyncHandler\BatchAsyncHandler from
    • https://speakerdeck.com/alli83/symfony-messenger-et-ses-messages-a-la-queleuleu-dot-dot-dot-et-sil-etait-temps-de-grouper
    • https://wolfgang-klinger.medium.com/how-to-handle-messages-in-batches-with-symfony-messenger-c91b5aa1c8b1
    • https://github.com/wazum/symfony-messenger-batch
  • Add Flow\AsyncHandler\DeferAsyncHandler to gain granular control on the async Event::SYNC step event
• Flow\Flow\YFlow rework
• Add more exemples in examples/yflow.php to play with Y-Combinators
• Update DX for Flow\DriverInterface : add defer to gain much granular control on asynchronous callbacks

Full Changelog v1.2.0...v1.2.1