Shrinking Infinite Loop Bug on Signed Integers

[alpaylan]

The current implementation of the shrinker for signed integers fail when the element is ::MIN. A possible fix can be found in the following commit.
alpaylan@d87e8f5

[neithernut]

Looks like a duplicate of #301? If that's the case then #296 should fix this while being more general.

[alpaylan]

Ah, yes, that's a better solution. I was using quickcheck as part of a research project, needed a quick fix, but saw old issues for the problem were still open, so I just wrote a quick fix and wanted to notify the project, closing.