u3 Utility Functions

The package `u3` (version 0.1.1) provides a small collection of general-purpose utility functions, primarily demonstrated with `cache` for function memoization and `eachCombination` for iterating through all permutations of given alternatives. First released in 2016, its low version number and lack of recent updates strongly suggest it is no longer actively maintained, making it an abandoned project. Its primary differentiators are its minimal footprint and specific focus on these two common patterns, likely intended for internal project use rather than a broad utility library like Lodash or Underscore. It exclusively uses CommonJS modules, reflecting its age, and does not appear to have a defined release cadence beyond its initial publication. It was designed to offer basic helper functions for related projects such as `e3` and `dataflower`.