This was merged quite some time ago: https://github.com/MARCspec/MARCspec/commit/2b1d4916eeb91f072516f1b6528c2bd3bd7366c2 But I still see `020$s{?020$a}` at http://marcspec.github.io/MARCspec/marc-spec.html
This was merged quite some time ago: 2b1d491
But I still see
020$s{?020$a}at http://marcspec.github.io/MARCspec/marc-spec.html