NeoNonEmpty

Like NonEmpty, but with a few changes:

• Show and Read instance similar to that of normal lists
• 100% safe API
• A few added/removed/changed functions (see Data.List.NeoNonEmpty's module docs)
• API isn't tied to version of GHC/base

The show instance is the original raison d'être. When scanning textual data, the brain can interpret uniformity more quickly. Which do you think is easier to scan?

> x :| [y, z]
> [x, y, z]

Now imagine this in various fields of a large compound structure, and you have two of them, and you're trying to find the difference.

>>> :set -XOverloadedLists
>>> aNonEmpty [1, 2, 3]
[1,2,3]
>>> read "[1, 2, 3]" :: NonEmpty Int
[1,2,3]