Always use barrier #2
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Previously, we skipped creating a barrier when only one task was required to complete before continuing the workflow. However, this sometimes led to duplicate tasks when a task in a
Chainwas (incorrectly) retried after already having completed previously. To alleviate this, we now always create anAtMostOncebarrier, even if we only await the completion of a single task.I also added a bit of documentation about the custom barrier implementation and a way to switch to the more lenient default
Barrierimplementation of dramatiq.