Fetch breaks on Cats 2.7.0 due to Traverse implementation detail about fetch HOT 2 CLOSED

Thanks, @sloshy. I agree with you. We probably want to add a way to explicitly mark a series of operations to be potentially processed as a batch (if it doesn't exist yet), update the traverse tests to do not rely on map2, and release a version marked with breaking changes. Those are my thoughts but looking for other opinions as well.

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Thanks for the thorough investigation and clear writeup @sloshy. I agree, a breaking API change to allow users to make the desire for batching explicit is the way to go. Even if we hadn't run into this issue, having batching happen automatically and invisibly like this is a bit too magical for my liking.

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