3.12.0:

This release makes some major internal changes to how Hypothesis represents data internally, as a prelude to some major engine changes that should improve data quality. There are no API changes, but it's a significant enough internal change that a minor version bump seemed warranted.

User facing impact should be fairly mild, but includes:
* All existing examples in the database will probably be invalidated. Hypothesis handles this automatically, so you don't need to do anything, but if you see all your examples disappear that's why.
* Almost all data distributions have changed significantly. Possibly for the better, possibly for the worse. This may result in new bugs being found, but it may also result in Hypothesis being unable to find bugs it previously did.
* Data generation may be somewhat faster if your existing bottleneck was in draw_bytes (which is often the case for large examples).
* Shrinking will probably be slower, possibly significantly.

If you notice any effects you consider to be a significant regression, please open an issue about them.

(adam)