It would be useful to be able to interrupt the a/b test and select a winner at will, instead of having to wait for the test to complete (which lasts at least 6hrs).
There are a few reasons for this:
1) One of the tests might show to be much better very quickly
2) One of the tests might have slightly less opens, but a significantly better CTR
When choosing a winner, the unsent portion would be sent immediately.
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