t / chainlint / arithmetic-expansion.expecton commit strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()` (5ef264d)
   1(
   2        foo &&
   3        bar=$((42 + 1)) &&
   4        baz
   5>) &&
   6(
   7?!AMP?! bar=$((42 + 1))
   8        baz
   9>)