In addition to this, Andy is performing wonders for Guile Scheme.

It is rare to see such lucid communication and such a clean commit history for hard technical development.

http://git.savannah.gnu.org/cgit/guile.git/log/

https://lists.gnu.org/archive/html/guile-devel/2018-05/msg00...

In a few years, all the cool kids will switch from Graal to Guile for language development.