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This release makes two changes:
* It makes the calculation of some of the metadata that Hypothesis uses for
shrinking occur lazily. This should speed up performance of test case
generation a bit because it no longer calculates information it doesn't need.
* It improves the shrinker for certain classes of nested examples. e.g. when
shrinking lists of lists, the shrinker is now able to concatenate two
adjacent lists together into a single list. As a result of this change,
shrinking may get somewhat slower when the minimal example found is large.