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Negative acknowledges of one or more messages.

This is a RabbitMQ specific extension to AMQP 0.9.1. It is equivalent to `reject/3`, but allows
rejecting multiple messages using the `multiple` option.

## Options

  * `:multiple` - If set, all messages up to the one specified by `delivery_tag`
    are considered as not acknowledged by the server. Defaults to `false`.
  * `:requeue` - If set, the message will be returned to the queue and redelivered
    to the next available consumer. Defaults to `true`.
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