This is a Chibi Scheme port of the Standard Implementation of SRFI 19.
The bulk of the code is from the standard implementation, with only a few tweaks to make it work under Chibi Scheme. The test suite has been expanded so that each exported function is exercised at least once.
The full source of this version is available on GitHub.
Many thanks to Will Fitzgerald and the SRFI Editors for providing the SRFI and the standard implementation code.
This implementation has two new format directives that I'd really rather were better supported everywhere.