I'm sort of guessing here, but maybe it's an alternative to GNU Readline. I'm not sure I understand what problems with GNU Readline the authors were trying to

I'm sort of guessing here, but maybe it's an alternative to GNU Readline. I'm not sure I understand what problems with GNU Readline the authors were trying to solve. It being written in Rust is definitely not a plus, because the toolchains for integrating C are mature in most mainstream languages.