Upon any unanticipated circumstance, bail to default implementation of an algorithm.

Most likely the dispatch logic will need to become more sophisticated as accelerated alternative implementations are added.

We are excited to review your PR.

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• There's a descriptive title that will make sense to other developers some time from now.
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• Your change description explains what the change does, why you chose your approach, and anything else that reviewers should know.
• You have included any necessary tests in the same PR.