tarantool / sharded-queue / 6705117383

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github

drivers: fix concurrency with mvcc

By default idx:max() or idx:min() have read confirmed isolation level.
It could lead to a task duplication or double task take when we
already insert or update a task, commited, but it is not yet
confirmed.

See also:

1. https://github.com/tarantool/queue/issues/207
2. https://github.com/tarantool/queue/pull/211

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