(author here) Just to be clear for other readers, we still avoid the dangerous behavior while allowing the (arguably confusing) behavior that autoconf requires.

(author here) Just to be clear for other readers, we still avoid the dangerous behavior while allowing the (arguably confusing) behavior that autoconf requires. And this only changes OSH, not YSH / Oil, which is still statically parsed. It's true that most of the strictness has become opt-in rather than opt-out, but it's still there! So you can choose it if you want. The Oil language / YSH is basically just OSH, with a bunch of strict options and new features on top (with new syntax)! Surprisingly, that's enough to make it a brand new language.