-- Paren-grouped prefix-comparison inside a HOF predicate parses as a
-- grouped call, not a zero-param closure. `(>x hi)` means `> x hi`
-- (a bool), not `(>n;hi)` (a lambda). Use this form to compose
-- conditions naturally: `| (<x lo) (>x hi)` is "outside the band".
out lo:n hi:n>L n;flt (x:n>b;| (<x lo) (>x hi)) [1.0 9.9 -8.5 2.0]
-- run: out 0.0 5.0
-- out: [9.9, -8.5]