Takes a predicate and pre-generates a base64 encoded bit-set, that evaluates at run-time to create a Utils.CharBitSet.
Takes a predicate and pre-generates a base64 encoded bit-set, that evaluates at run-time to create a Utils.CharBitSet. Useful for pre-computing Char predicates that are unfeasible at runtime, e.g. because they're too slow or because they don't work in Scala.js