This release adds a heuristic to detect when shrinking has finished
despite the fact that there are many more possible transformations to
try. This will be particularly useful for tests where the minimum
failing test case is very large despite there being many smaller test
cases possible, where it is likely to speed up shrinking dramatically.
In some cases it is likely that this will result in worse shrunk test
cases. In those cases rerunning the test will result in further
shrinking.
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