## Fix default retries
By default, if no `retries` property has been set, jobs / tasks should
not be retried. This was not the case previously, as the `maxRetries`
variable was `undefined`, causing jobs to retry endlessly. This PR sets
them to `0` by default.
Additionally, this fixes some undesirable behavior of the workflow
retries property. Workflow retries now act as **maximum**,
workflow-level retries. Only tasks that do not have a retry property set
will inherit the workflow-level retries.
## Fix error messages
Previously, you were able to encounter error messages with undefined
values like these:
Reason is that it was always using `job.workflowSlug` for the error
messages. However, if you queue a task directly, without a workflow,
`job.workflowSlug` is undefined and `job.taskSlug` should be used
instead.
This PR then gets rid of the second undefined value by ensuring that
`maxRetries´ is never undefined
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