icu

In the locale unicode and transform extensions code, we currently have data structures that look like:

pub struct Keywords(Option<Box<[(Key, Value)]>>);

where we have an array of key, value pairs that are kept in sorted order and are used like a HashMap. Since this code was originally written, we've added a litemap crate to util that works for these use cases. We should investigate s

Are there any cheat sheets of stringi available? Like this one of stringr: http://edrub.in/CheatSheets/cheatSheetStringr.pdf

It would be more efficient to have a cheat sheet since R base, stringr, and stringi have different but similar types of syntax, which could be confusing some times.

Right now we only support either a custom message syntax validator or the ICU Message Syntax. We can start to add builtin support for other syntaxes