def char.ok
import ezx@1.11.0.0/src/add/plan.bend as Planimport Base
511# whether a char may stand in a hash that names a directory under `.ez/lib`
512def char.ok(+ch: Char) -> Bool:
513 Bool.not(Bool.or(Char.is_eq(ch, '/'), Char.is_eq(ch, '\\')))