fastOpt not properly producing hello example.

[vic]

In #12 there's a hello example that just logs a HELLO to the javascript console and renders a div.

For some reason doing ./ci mill examples.__.fastOpt, the produced out.js does not have any of the Main.scala code.

However doing

rm -rf out/examples/hello/**/fastOpt
mill examples.hello[2.13.3,1.1.0].fastOpt

produces it.

Not sure if it's a bug in mill due to using .__.fastOpt