I have a question about parameters in metafont files: i want to create something similar to mf/out/feta20.otf-table, but i don't understand how it's done (i tried to find "bbox" and "attachment" in mf files or scripts/build/gen-emmentaler-scripts.py, but there are no results). I also tried adding
autometric_parameter ("someBogusName", someValue); inside mf code, but there were no results. Here is roughly what i want to achieve: add a magical command to feta-flags.mf