Log Message:
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.