Thanks for breaking that down, it's all, uh, a little terse.

The ..^ operator (including the right endpoint?) doesn't do what I was expecting:

  > 1, 2, * + * ..^ * >= 100;
  1 2 _block298

Also, this seems a little unfortunate:

  > 1, * + * ...^ * >= 100;
  ===SORRY!===
  Method 'Bridge' not found for invocant of class 'Failure'

(I was expecting some warning about the closure expecting two arguments, and only getting one.)