nonempty-containers-0.3.4.5: Non-empty variants of containers data types, with full API

Efficient and optimized non-empty versions of types from containers. Inspired by non-empty-containers library, except attempting a more faithful port (with under-the-hood optimizations) of the full containers API. Also contains a convenient typeclass abstraction for converting betwewen non-empty and possibly-empty variants. See README.md for more information.