I would have thought that Coffeescript's optional chaining, present at least as early as v1.0 in 2010[0], would have counted as prior art. [0]: https://github.

I would have thought that Coffeescript's optional chaining, present at least as early as v1.0 in 2010[0], would have counted as prior art. [0]: https://github.com/jashkenas/coffeescript/blob/1.0.0/lib/parser.js https://github.com/jashkenas/coffeescript/blob/1.0.0/lib/par...