A step toward handling the arrival of new data (stdin) with priority
over commands, avoiding roundtrips and re-evaluations.
(cherry picked from commit 8a2a5197886025caf35653001f76a4b209d8c9e4)
See README. Most of this is in accordance with the bindgen introduction.
The c_headers function was taken from Zach Mitchell's work on bindings.
Co-authored-by: Zach Mitchell <zmitchell@fastmail.com>
(cherry picked from commit 83d8ae6b26d341bbd452a77d7361f58c06a2d322)
