A selection of utility methods for accessing Unicode
information about `Character`s and performing locale-aware
transformations on `String`s:
- [[uppercase]] and [[lowercase]] change the case of a
`String` according to the rules of a certain locale,
- [[graphemes]], [[words]], and [[sentences]] allow
iteration of the Unicode graphemes, words, and sentences
in a `String`, according to locale-specific rules,
- [[characterName]] returns the Unicode character name of
a character, and
- ...
