For upcoming feature work, we want the ability to make a single request

to publish a bunch of individual items (review requests and reviews) all

together.
To do this, we're introducing a new API-like endpoint for performing

batch operations. This doesn't exist in the official API because it

doesn't really mesh well with REST, and the actual endpoint may be in

flux for a bit.
We already have some batch-like operations in the dashboard UI that

currently just make a whole bunch of API requests for closing review

requests or changing visibility state. This new endpoint will also

enable these workflows, so we can handle it much more efficiently.
The new batch endpoint supports these operations:

close
discard
archive
mute
unarchive (effectively unmute too)
publish

Looked at e-mail previews for batch publishes with all combinations of

  review requests, review request updates, reviews, and review replies in

  both HTML and text mode.
Used all operations except for publish from real UI.
Ran unit tests.